Cable Pulley has a 6" diameter and the mounting hole through the bearing has a 3/8" diameter. Bearing has a 1" width from side to side of pulley.Inside Diameter 0.38 inOutside Diameter 6 inWeight 0.59 lbs.Replacement pulley for Maxicam machines.Original part number /(OEM) 0017-00009-0978 and Par-Pu102 OEM