Series 4 Single Cheek Block- 54mmPlain Bearing BlocksBarton plain bearing blocks have a precision moulded acetal sheave running on a large diameter brass bearing, ensuring free running under the highest of loads.Specifications:Sheave size: 54mm x 17mmMax rope diameter: 12mmSafe working load: 750kg / 1650lbsBreaking load: 1500kg / 3300lbsLength: 107mmWeight: 178g