Low-friction micro blocks are compact and lightweight. They are ideal for sailboards, smaller dinghies and lightly loaded control lines on boats of all sizes. Specifications Sheave diameter: 7/8″ (22 mm) Maximum line diameter: 1/4″ (6 mm) Fastener: #10 RH inch (5 RH mm) Mounting hole spacing: 2 1/8″ (54 mm) Cutout: 5/8 x 1 9/16″ (16 x 40 mm) Maximum working load: 200 lb (91 kg) Breaking load: 1200 lb (544 kg) Length: 2 5/8″ (67 mm) Weight: 1 oz. (28 g)