Uxcell Hollow Square Mortiser Chisel Auger Drill Bit Tool, 1/2-Inch Product Name: Square Chisel Mortiser Material: Metal Chisel Side Length: 13mm / 1/2inch. Chisel Depth: 60mm / 2.36inch. Bit Shank Diameter: 8mm / 0.3inch Bit Width (Bottom): 12mm / 0.47inch. Flute Length: 90mm / 3.54inch. Shank Diameter(Max): 19mm / 0.748inch Weight: 189g. Package Content: 1 x Square Hollow Chisel Bit Mortiser