Roller/roller bearing yacht blocks for high dynamic working loads. These blocks feature smooth running and light weight. Black anodized aluminum jaws, Delrin® bearing rollers and Torlon® side ball bearings ensure smooth running. The axle of the whirl is milled out to save weight. Designation Disc Ø mm Working load kg Breaking load kg Max. line Ø mm Shackle shackle Ø mm RBB60, single-disc with shackle and lower shackle 60 1,500 3,000 12 6 RBB80, single-disc with shackle and lower shackle 80 2,500 5,000 14 8