McKissick Construction Block, Series: 680, 9/16 in, 5/8 in, 3/4 in, 7/8 in Maximum Cable, 25 ton, 16 in Sheave Outside Dia, Bronze Bushing Bearing, Roll Forged Sheave, 2 Grooves, 30.75 in L x 4.34 in W x 3 in THK