Professional 90° V Groove Milling Bit Set (Please get the coupon code on the product page at a cheaper price when purchasing.) Solid hardened steel body, industrial grade tungsten carbide blade that meets the high demands of woodworking. Br> shaft: 6.35 mm (1/4); Cutting diameter: 6.35 mm, 7.94 mm, 9.52 mm, 12.7mm; Cutting depth: 6.35 mm, 7.94 mm, 9.52 mm, 12.7mm. Teflon coating resistant to deposits and heat. Clean cut, even rotation, fast operation. < Br> For cutting laminate, MDF, veneered plywood, wood panels, chipboard, softwood, etc. br>