Flat, stainless base plate distributes loads to larger surface area than other designs that place loads on mounting bolts only. Use on spars and deck to lead sheets, halyards, reefing gear, and any control requiring a strong, clean lead. Works with #55-60 to fit curved spars. Sheave Dia. 2" , Max Line 7/16", L 3-5/8", W 2-7/32", H 7/8", SWL 1750 lbs., Weight 5.9 oz., Max Line 7/16".