Ronstan Series 55 Ball Bearing Orbit Block - Single - Becket - Swivel Head

Ronstan Series 55 Ball Bearing Orbit Block - Single - Becket - Swivel Head. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises the mass of the inactive return race and hub. Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible. Multi-sheave blocks have only single intermediate cheeks and an ul