"BRONZE BUSHED; NEW STYLE BLOCKS FEATURE HIGHER WORKING LOAD LIMITS; PAINTED OR GALVANIZED STEEL WITH REPLACEABLE WOOD BUMPERS; LASER CUT SIDE PLATE OPENS FOR INSERTION OF WIRE ROPE; INCORPORATES EXCLUSIVE BOLT RETAINING SPRINT TO ASSURE NO LOST BOLTS, PLUS UTILIZES SECONDARY RETAINING PIN; BRONZED BUSHED SHEAVES WITH LARGER BEARING DIAMETER FOR EXTENDED BLOCK LIFE; UTILIZES CROSBY N SYLE HOOKS WITH INTEGRATED LATCH; LUBRICATED CENTER PIN; 10 INCH AND 12 INCH SIZES UTILIZE STEEL SHEAVES ; BLOCK SIZE-10 INCH"