Part No. 086 Sheave (mm)29 mm Sheave (in)1 1/8 in Maximum line (mm)8 mm Maximum line (in)5/16 in Maximum working load (kg)272 kg Maximum working load (lb)600 lb Low-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications.