Harken 57mm Zircon block
SKU: 19876048929

Harken 57mm Zircon block

$312.75 $347.50
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Ships within 48 hours · Estimated delivery Jul 9 - Jul 14

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Description

Harken 57mm Zircon blockUse the Harken Zircon blocks for precision trimming. The blocks are very efficient that you can adjust the sail and sheet tension perfectly. Harken Zircon blocks are made for jib sheets, spinnaker sheets and mainsail sheets. The Zircon blocks are the most efficient Harken has ever made. The performance is unmatched due to the ceramic ball bearings. With the Zircon blocks the energy loss caused by friction is extremely low. Even lower than the amazing

Use the Harken Zircon blocks for precision trimming. The blocks are very efficient that you can adjust the sail and sheet tension perfectly. Harken Zircon blocks are made for jib sheets, spinnaker sheets and mainsail sheets.

The Zircon blocks are the most efficient Harken has ever made. The performance is unmatched due to the ceramic ball bearings. With the Zircon blocks the energy loss caused by friction is extremely low. Even lower than the amazing Carbo range from Harken. So especially when the breeze backs off, the Zircon blocks let you ease.
Zircon bearings are more than 700% stronger than stainless bearings. This becomes evident when you need to ease a sail in very light air. You feel even the slightest fluctuations in sheet load.

 

Series Zircon
Sheaves Ø 57 mm
Number of sheaves 1
Bearing Ball bearing
Max rope diameter 10 mm
Swivel No
Cam No
Ratchet No
Breaking Strength (kg) 900
Safe Working Load (kg) 300
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 19876048929

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4.6 ★★★★★
Based on 338 reviews
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Product Reviews
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Verified Purchase
Maverick
Massapequa, US
★★★★★ 5
Absolutely would buy again
Color: Orange
I love this, my pup loves this. Strong, sturdy. Shakes all over the place. Pup loves to chew on it, I think the vibration comforts her gums from teething. Perfect size You must take the outer skin off and pop open the white power button to charge it. Total fun!
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Reviewed in the United States on March 22, 2026
T
Verified Purchase
Thomas Latham
Battle Creek, US
★★★★★ 4
Rubber blue cover won't come off.
Color: Orange
If you want to keep the blue cover on that your dog chews off every other ball that is similar, get this one. Most dogs will not chew it off. It stretches when the chew on it so it can't be chewed or stretched off the ball. I've got a blind dog and she will kick it around for an hour at a time. It keeps her active and having fun.
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Reviewed in the United States on November 8, 2025
T
Verified Purchase
Travis
Chelsea, US
★★★★★ 3
Nice, but...
Color: Orange
It's a good idea & keeps my 1yr old Staffy/Pit occupied, BUT... The rubber around the ball is either too easy to chew through or my pup is just an aggressive chewer. Either way, it's a plus that it does come with an additional rubber, but it would be nice to also be able to buy additional ones vs having to buy the whole toy again & again! Oh, & if you think about letting them play with it without the rubber please be on the lookout for the rubber covering where you would charge it because my pup managed to locate & destroy that cover piece as well haha!
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Reviewed in the United States on August 27, 2025
J
Verified Purchase
Janice
Houston, US
★★★★★ 5
Good quality
Color: Orange
This interactive dog ball has been a fun and engaging toy for my dog. It entertained much longer than regular toys.
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Reviewed in the United States on April 22, 2026
D
Verified Purchase
Drew K.
West Palm Beach, US
★★★★★ 5
Entertains my husky!
After some research, I decided on this interactive toy for my young husky. I chose it over others because I liked that it was wrapped in a silicone cover so it wouldn't be as hard on her teeth, or my floors. It also seems to have helped with durability. She's never had this sort of automated toy before to engage with and it surprised her at first, but then she really got into it: pawing and nosing and sometimes howling at it. I was worried it would drive her and/or me crazy, but so far so good. She will play with it for a good 10 minutes at a time and it seems to provide some good mental stimulation since it rolls and spins unpredictably. It is easy to charge and was ready to use right out of the box. It has proved durable in the first week surviving my crazy pup and multiple trips down the stairs. I am also happy to report that it has worked pretty well on the carpet/rug areas of the home. It should work pretty well unless you have a very thick shag carpet. We'll see how long it lasts, but highly recommend so far.
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Reviewed in the United States on July 1, 2025

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