40mm Double Sheave Fishing BlockLow-friction Carbo Air blocks are lightweight, strong, and reliable. These compact blocks have very high working loads and smooth operation to simplify the positioning and retrieval of teaser lines. Specifications: Sheave ; (mm): 40 mm Sheave ; (in): 1-9/16 in Maximum line ; (mm): 10 mm Maximum line ; (in): 3/8 in Maximum working load (kg): 220 kg Maximum working load (lb): 485 lbs