NIUNIU DESIGNED Professional Great for drilling square holes in wood with a mortising machine or a mortising attachment.Fits all mortising machines and drill press attachments. Square hole drill is mainly used for woodworking aspects. WHY CHOOSE THIS ITEMReduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries. NOTEThe square hole punching needs to use electric drill, hammer & other tools.(All of these are not include) Delivery Quantity: 1pc, Package Contents: Only the above package contents, excluding other products. Size: blade length 41.5mm, total length 118mm, blade diameter 6.4mm, shank diameter 19mm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Color: silver (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)