Carbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing. On/off switch operates from both sides. Standard grip: medium/light air; 10:1 holding power Part No. 2673 Sheave Ø (mm) 57 mm Sheave Ø (in) 2 1/4 in Maximum line Ø (mm) 10 mm Maximum line Ø (in) 3/8 in Maximum working load (kg) 359 kg Maximum working load (lb) 792 lb These blocks are the popular choice for Topaz Uno Mainsheet Block