Single Pulley BlockIncorporating 50mm diameter aluminium pulley accurately centred in a metal frame. These blocks are available in double and triple sheave form with plain bearing pulleys. The bearing pin may be rapidly removed from the frame thus releasing the pulley(s) and allowing easy 'stringing up'.A simple locking system prevents the pin accidentally coming out.All blocks have a hook at each end.Overall length of frame: 70mm.Maximum Weight: Approx. 2kg