Flat Base Cheek Blocks are ideal for use on spars or the deck to lead sheets, halyards, reefing gear and any control line requiring a smooth lead. Two cheek blocks for sale: Single cheek block with aluminum sheave Good condition $50 Compare with $240 new Double cheek block with Delrin sheave Good condition $50 Compare with $230 Series 5 cheek blocks: Maximum line size: 7/16" (11mm) Safe working load: 1750lbs. (795kg) Dimensions: 3-5/8" (92mm) L x 2-7/32" (57mm) W Hole centers: 3"(76mm) Sheave diameter: 2" (51mm)