McKissick Utility Crane Block, Heavyweight, Series: 380, 5/8 in, 3/4 in, 7/8 in, 1 in Maximum Cable, 45 ton, 18 in Sheave Outside Dia, Roller Bearing, Roll Forged Sheave, 3 Grooves, 47.31 in L x 22.75 in W x 16.5 in THK