The Harken 57mm Ratchet Block Swivel, 2x Grip provides sailors with three holding-power options to ensure optimal performance in varying wind and sea conditions. The on/off switch can be operated from either side, making it user-friendly. With a 20:1 holding power, this block is ideal for handling big breezes and steady conditions. Maximum line diameter is 10mm or 3/8 inches, and the maximum working load is 227kg or 500 lbs. Part No. 2169. Sheave Ø of 57mm or 2 1/4 inches.