"Chicago Die Casting 300A 5/8"" Pulley with 3"" Single V Groove Chicago Die Casting 300A 5/8"" Pulley with 3"" Single V Groove Features: All pulleys have 0 spokes except 600 A series which has 4 spokes Bore diameter 5/8"" 3"" outside diameter, 2 3/4"" pitch diameter Carded"