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75mm carbo air block - single ratchet with swivel lightweight, strong, reliable and affordable. Safe and easy trimming. Blocks are 30% lighter with a 60% higher working load than classic blocks. Open air block design eliminates unnecessary material and weight. Ball bearings, sheave, and side plates are UV stabilized with carbon black for maximum protection. Patented switch locks shackle in front or side positions, or lets block swivel to keep line from twisting. Maximum working load: 750 lb. (341 kg). weight: 8.0oz (226G). sheave diameter: 2-15/16" (75 mm). maximum line size: 7/16" (11 mm). maximum working load: 750 lb. (341 kg). weight: 8.0oz (226G). sheave diameter: 2-15/16" (75 mm). maximum line size: 7/16" (11 mm).