2pcs Stepped Ceramic dental bearings SR144TLKZWN for KAVO handpiece 3.175x6.35x5.98x2.78mm SR144TLKWZNDental Bearings High SpeedCeramic balls Size:3.175x6.35x5.98x2.78mmMaterial:Stainless steel+CeramicPackage include:2pcs x bearings