McKissick Utility Crane Block, Lightweight, Series: 380, 9/16 in, 5/8 in, 3/4 in, 7/8 in Maximum Cable, 30 ton, 16 in Sheave Outside Dia, Roller Bearing, Roll Forged Sheave, 4 Grooves, 39.75 in L x 20.25 in W x 10.44 in THK