uxcell Woodworking 5/16" Hollow Square Mortising Chisel Bit Product Name: Square Chisel Bit Mortiser Material: Metal; Chisel Side Length: 8mm / 5/16"; Chisel Depth: 60mm / 2.36" Bit Shank Diameter: 6mm / 0.23"; Bit Width (Bottom): 8mm / 0.3"; Color: As Picture Show Flute Length: 85mm / 3.34"; Shank Diameter(Max): 19mm / 0.748"; Weight: 144g Package Content: 1 x Square Hollow Chisel Bit Mortiser