Designed to enable Biscuit Joint Slots to be machined into chipboard, MDF and solid timbers using a hand-held routing machine. Maximum Diameter 40mm. Bore Diameter 6.35mm. Cutter is supplied with three bearings: TTB15, TTB19 and TTB23. A range of Biscuits and replacements for Bearings, Arbor (TTLDTANB) and Groover (TTBJSG40) available.