22mm Micro Block with SwivelLow-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: 22mm / 7/8in.. Length: 60mm / 2-3/8in.. Weight: 28g / 1oz.. Shackle pin: 4mm / 5/32in,. Maximum line: 6mm / 1/4in.. Maximum working load: 91kg / 200lb. Breaking load: 544kg/ 1200 lb