Uxcell a14120500ux0553 1/2" x 2" Straight Shank Round Nose Core Box Router Bit Cutter Tool Product name: core bit router box; material: steel, carbide; standard: 1/2 "x 2" Stem diameter: 12.7Mm/ 1/2 "; cutting diameter: 50.8Mm/ 2" Cutting radius: 25.4 mm/ 1 "; depth of cut: 29.5 mm/ 1 1/8"