"Chicago Die Casting 600A 5/8"" Pulley with 6"" Single V Groove Chicago Die Casting 600A 5/8"" Pulley with 6"" Single V Groove Features: All pulleys have 0 spokes except 600 A series which has 4 spokes Bore diameter 5/8"" 6""outside diameter, 5 3/4"" pitch diameter Carded"