Trend B182 Bearing 18.2mm diameter 1/4\" boreBearing 1/4 inch boreBearings are shielded to prevent penetration of dust and grease packed for life. They should not be cleaned with solvent or lubricated as this will dissolve the grease and cause premature bearing failure. Scrape off any resin build-up.Ref. B182 is sleeved and can be reground.Always check the tightness of the fixing screw before using cutter.Specification-OD=18.2 mmID=1/4 inchID=6.35 mmThickness=3/16 inch