... interchangeablity & high strength 3.Smooth surface Taper Bushing:1. European Standard Type: 1008, 1108, 1210, 1215, 1310, 1610, 1615, 2012, 2517, 3020 ... , phosphateFeatures:1. Standard method for measureing keyseat depth.2. Excellent and high quality control, advanced producing equipment.3. Easy to install with long ...