80 mm Roller Bearing Block - Double, Swivel Optimist The 70 mm Plain Bearing

The 70 mm Plain Bearing Block - Single Becket is designed for high strength and performance on medium sized boats

Glass fiber reinforced cheeks and box provide strength

A solid track with no holes for installation

polymer sheave

Part number 442-113

80 mm Roller Bearing Block - Double, Swivel Optimist The 70 mm Plain BearingThe RBB80 Double Roller Bearing Block is designed for high load, dynamic applications. Made with top quality materials like machined black anodised aluminium and Torlon roller bearings, it ensures durability and performance under all conditions. The marine grade stainless shaft is swiveling but can be fixed in 0 or 90 position with a set screw. It is hollow and chamfered to reduce weight and the shackle is optimized with a 6 mm body and 8 mm pin. All