McKissick Utility Crane Block, Lightweight, Series: 380, 3/4 in, 7/8 in, 1 in, 1-1/8 in Maximum Cable, 40 ton, 20 in Sheave Outside Dia, Roller Bearing, Roll Forged Sheave, 3 Grooves, 50.06 in L x 24.75 in W x 10.38 in THK