US STOCK, You will receive the package within 5 workdays !!! DIY Supplies : WoodworkingQuantity: 1pc Type : Gun Drill Bit Name : Square Hole Chisel Mortising Kits Tools Material : High-speed steelSize: 1/4 Inch (6.4mm),5/16 Inch (8mm), 3/8 Inch (9.5mm), 1/2 Inch (12.7mm). Weight: 6mm:135g, 8mm:140g, 9.5mm:160g, 12.7mm:215g Feature1 : Metalworking Feature2 : Wood Drilling Feature3 : Core Drill Bit Feature4 : Handle Ladder Drill Feature5 : Shank Reaming Drill Feature6 : Metal Drilling Feature7 : Hand Tool Sets Feature8 : Drill Bits Feature9 : Square Hole Drill Bit Feature10 : 1/4 to 1/2 Square Hole Drill Bit Feature11 : Square Hole Drill Features: 1.Made of high-speed steel. Heat treatment, HRC48~50, high hardness, lengthened core, high concentricity. 2.Great for drilling square holes in wood with a mortising machine or a mortising attachment. Fits all mortising machines and drill press attachments. 3.It will get double effect by matched use with mortise and tenon machine.The square hole punching needs to use electric drill, hammer & other tools. 4.Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries. 5.Professional wood drill bit, suitable for construction, installation, renovation, decoration industry, etc. 6.The utility model in the hole drilled by the rotary body, while the impact of the use of hammer impact force transmitted to the outer,body the material crushing round hole and square head wall, a one-time processing of a square hole, and the dust can be broken slag discharged from the tube. Description:Packing list: 1pc x HSS Twist Drill Bits