Feature: *Large diamter bits with smaller shanks to enable use in standard drill chucks. *Punching is easy and durable, sharp and wear-resistant, can be used with extension rods (not included). *It can be used for various woodworking drilling, suitable for solid wood boards, composite boards, wood products, plastics, PVC pipes and so on. *Equipped with a 1/2' (12.5mm) adapter, compatible with electric wrench, lithium battery wrench, etc. Be sure to use it after installation, pay attention to safety. Specifications: Product name: Drill Bit Material: HSS Color: Gold, Black Shank: 14mm Length: (Approx. ) 125mm Optional Size: 14mm, 16mm, 18mm, 20mm, 22mm, 25mm Suitable for: solid wood boards, composite boards, wood products, plastics, PVC pipes and so on. Quantity: 2pcs set Package Included: 1 Drill Bit 1 1/2' Wrench Adapter Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.