The Harken 1.00 Wire Sheave is expertly designed for custom marine applications, featuring high-load composite bearings and hardcoat-anodized aluminum with PTFE impregnation. With a maximum line diameter of 4 mm (5/32 in) and a maximum working load of 454 kg (1000 lb), it is a reliable choice for sailors. Part No. 303, the sheave has a diameter of 25 mm (1 in).