Square Hole Drill Bit, Steel Hardness Sharp Durable Mortising Chisel Set 1/2-Inch, 1/4-Inch, 3/4inch, 3/8-Inch, 5/8-Inch, 5/16-Inch, 9/16-Inch Woodworking Mortiser Drill Bit-7pcs: Maxedbuy.com

Long time warranty & unique value Warranty 14 months,a warranty system, to provide repair parts. Professional sellers, and professional guidance, have more tool accessories to choose. Provide professional use tutorials,pls contact us. Often give away free tool products (because we clean stock),pls contact us. Be careful The blade edges are extremely sharp (be careful) and the bit is well lubricated. For those of you unfamiliar with mortising chisels, these will drill a square hole for you. Take your time and be sure to keep things well lubricated. The shaft space is milled perfectly with no play whatsoever. That means you will get a great hold alignment that is straight and clean. No doubt these people know how to make great tools. Use matters: Square hole drill is mainly used for woodworking aspects. Various existing bits, can only process a circular hole, square hole can not be processed, to machining square hole, must drill the hole or cutting machine processed crude hole, then chisel made from artificial hand. 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. Package nclude: 1 x 1/2-Inch(12.7mm) 1 x 1/4-Inch(6mm) 1 x 3/4inch(19mm) 1 x 3/8-Inch(9.5mm) 1 x 5/8-Inch(16mm) 1 x 5/16-Inch(8mm) 1 x 9/16-Inch(14mm)