Schaefer Aluminum lead block swivels 45 to each side of the track preventing the block from hitting the deck.Computer-machined aluminum construction maintains sideplate strength while minimizing weight, giving these blocks an incredible strength-to-weight ratio and a distinctive, clean look. Torlon rollers and Delrin ball bearings in the sheave handle high loads with low friction. An excellent alternative for sailors interested in a lightweight choice.Key FeaturesCNC-machined aluminum with outstanding strength-to-weight ratioT-Track runs on polyethylene linersTorlon rollers and Delrin ball bearings handle high loads with low frictionFinished in hardcoat anodized black for durabilityMachined center of the block may be used as a "becket"Max. Working Load (MWL): 2800 lb. (1270 kg)Weight: 1 lb. (454 g)Length: 4" (102 mm)