Material: Alloy (Drill Bit ), Aluminum (Case) Woodworkers 35-Piece 1/4 "Router Bit Set in New Aluminum Case A complete 35-piece set of TCT tip router bits. 6.35mm shank accessories (1/4 "). Strong Tungsten Carbide Tip (TCT) These router bits can be re-sharpened as needed. Manufactured with sealed bearings for a smooth cut. Contained in an aluminum carrying case with handle and double snap closure. Suitable for use with chipboard, MDF, hardwood, and softwood. All contained in a sturdy aluminum storage box.