This mortise converter is made of iron, which has reasonable design, practical functions, and can be well applied in woodworking work. Simple structure and excellent craftsmanship make it easy to use and have excellent durability, will provide you with good service and support your repeated use. Features -Material: Iron -Size: About18.00X8.00X8.00cm/ 7.07X3.14X3.14in. -Type: 65-58 reducer sleeve. -Square mortise machine converter is small in size and convenient to carry, and use. - It is in stable characteristics, and high performance of wear-resistant, deform-resistant. - Bench drill converter is made with exquisite workmanship, high performance, and long life. - Made of iron, sturdy and durable, This attachment can convert a bench drill to a mortise machine. - The mortise machine converter is simple to install and disassemble, you can quickly install or disassemble by yourself. Package list: 1 x bracket 1 x deceleration ring