RONSTAN 15mm Utility Double Block - Loop Head & Becket, RF15212 Sailboat Blocks & Hardware_16 mm Classic Cheek Block Designed to handle the high

Designed to handle the high loads generated by modern racing and cruising boats

Can be stacked to create a double version

Stainless steel straps and posts

Ball-bearing sheaves minimize friction

Curved ball races allow Schaefer ball-bearing blocks to take higher loads than other similarly sized blocks

RONSTAN 15mm Utility Double Block - Loop Head & Becket, RF15212 Sailboat Blocks & Hardware_16 mm Classic Cheek Block Designed to handle the highThe Ronstan Series 15 Ball Bearing Double Block with Becket is a tiny, light, and versatile block with a 5 8" diameter sheave and a very high breaking load. Ronstan's Series 15 Ball Bearing Utility Blocks are the tiniest ball bearing blocks anywhere, running on sheaves only 5 8" (15 mm) in diameter. They're so light, strong, and inexpensive that you can use them in lots of creative applications, like shock cord retractors for your control lines,