Features- Great Material: This square hole chisel drilling machines are made of bearing steel, deform-resistant, and strong, and not easy to rust- Save : The mortise machine converter is easy and simple to install and disassemble, can quickly install or disassemble yourself- Wide Application: Tenon joint mortising attachment is suitable for material with low hardness such as compressed board, density board, plastic, sandalwood, pine, ash, pine- Multifunctional: The bench drill is suitable for construction, DIY woodworking, decoration and other industries. Can be for groove, internal grinding, metal drilling and more- Notice: Be with square hole drilling machines, not electric drills.Mainly for drilling square grooves on professional wood, and not suitable for hard materials such as metal, glass, and plasterboardSpecification:-Material: Iron-Size: About 18.00X8.00X8.00cm./7.07X3.14X3.14in-Type: 65-58 reducer sleevePackage Including1 x bracket1 x deceleration