74-83 Double control block with cam cleat allows mounting of the control block directly on the Schaefer 1-1/2" traveler track. Hardcoat anodized aluminum base with Schaefer 5 series ball bearing sheaves and stainless steel cheeks for reliability and low-friction leads. Becket is removable for use with pre-spliced line. Uses Schaefer 70-17 Fast Entry cam cleats for easy line engagement. Use with Schaefer traveler cars 72-83, 72-78 for a 3:1 purchase. Use with 72-92 for 4:1 purchase. Length = 5-1/4” (133mm), Width = 3-5/8” (92mm), Thickness = 2-7/32” (56mm), Weight = 1bs.4oz.(567g)