Features: brand new and high quality Advanced technology manufacturing and durable materials: Made of alloy and heat-treated, the blade has the characteristics of high precision, smooth cutting operation, good shock resistance, and good toughness. High quality: low cutting resistance, increased opening speed, easy chip cutting, no tremor. The perforation is neat, smooth and without broken edges. Wide range of applications: any wood and wood products, plastics, plywood and other materials that you need beautifully perforated, suitable for industrial hinge installation, wood processing and maintenance, model making, goal installation, drawer installation and other occasions. Designed for durability and long life, creating a beautiful smooth finish. Different sizes to choose from 16/18/20/22/25mm Specifications: Material:Alloy Color:Red Size1: Approx.16mm/0.62inch Size2: Approx.18mm/0.70inch Size3: Approx.20mm/0.78inch Size4: Approx.22mm/0.86inch Size5: Approx.25mm/0.98inch Note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1PcxThreaded Lengthened Woodworking Hole Opener