Harken 16mm Airblock Pivot Cheek Block Tracking_Boardfy It adjusts like a standard

It adjusts like a standard lace-up but the ankle strap gives you extra support at the joint and keeps the fit locked in without the laces working loose mid-race

Sheave 16 mm Length  76 mm Weight  27 g Maximum Line  5 mm Fasteners  4 RH mm Maximum Working Load  113 kg  Breaking Load  544 kg

Length 61 mm Maximum Rope Diameter  10 mm Weight  27 g Breaking Load  400 Kg Maximum Working Load  200 Kg

Perfect for layering under a wetsuit

Harken 16mm Airblock Pivot Cheek Block Tracking_Boardfy It adjusts like a standardThe 16 mm is Harkens smallest block. It is perfect for small synthetic control lines found on high tech dinghies. The patented bearing system uses stainless steel balls in a captive grooved race and has a 250 lb (113 kg) maximum working load. Sheave 16 mm Length 35 mm Weight 11 g Maximum Line 5 mm Maximum Working Load 113 kg Breaking Load 339 kg