IDC BK030-7/8 IDC Select IDC BK030-7/8 Light Duty Type 2 Single Groove Sheave With 3/16 × 3/32 in Keyway and Setscrew, Bored to Size Bore, 7/8 in Dia Bore, 3.15 in OD, 2.8 in Dia Pitch, 13/16 in W Face