03-30 Stainless Steel cheek block with curved base. Fits spar diameters up to 2". Delrin(tm) plain bearing sheave ensure high safe working load and is good for static loads. Sheave Dia. 1-7/16" (37 mm), Max Line 7/16" (11 m), L 3-11/16" (949 mm), W 1" (25 mm), H 3/4" (19 mm), Fasteners (4) #10 RH (5 mm), C/C 3-3/16" (94 mm), SWL 1000 lbs. (450 kg), Weight Stain. 2.2 oz. (62 g), Weight Alum. 2.1 oz. (59 g)