2 Series Aluminum cheek with curved base cheek block. Curved base fits spar diameters up to 2". Delrin(tm) plain bearing ensures high safe working load and is good for static loads. Sheave Dia. 1-1/16"" (27 mm), Max Line 5/16" (8 mm), L 3-1/2" (89 mm), W 1" (25 mm), H 21/32" (17 mm), Fasteners (4) #10 RH (5 mm), C/C 3" (76 mm), SWL 900 lbs. (410 kg), Weight Stain. 1.5 oz. (42 g).