ITEM NAME:4Pcs Round Over Edging Router Bit 1/4'' Shank 1/2'' 3/8'' 1/4'' 1/8'' Radius Description: - Industrial Quality Router Bits,C3 Micro-grain Tungsten Car.Can be used without the bearing as a standard straight bit. - Radius: 1/2", 3/8", 1/4", 1/8". - 1/2" R Total length: approx.2-1/2". - Material: Hardened Steel.