Features: *The hole opener is made by a special vacuum brazing process, so the service life of this hole opener is 5 times that of the traditional ceramic tile drill, which is durable and long-lasting; *The hole opener can drill quickly, easily and cleanly on tiles and other materials (marble, granite, clinker, roof ceramic, plastic, etc.) without water; the M14 connector makes this hole opener suitable for all common angle grinders, so it should be an essential part of every tiler's tool kit; *The drilling performance of the hole opener is about 1cm in 10~15 seconds, the drilling depth is 40mm; even in very hard materials such as granite, the drilling speed of the hole opener is very high; besides, the setting time is extremely short, which can save money in the long run; *Used in metallurgy, petrol, electronics, electrical appliances, chemical, shipbuilding, machinery and other industries for the installation and maintenance of wires, pipes, signal lights and measuring devices, such as 68 mm: used for sockets, junction boxes and cavity sleeves 60-50 mm: use in various drain pipes 32-40 mm: use for water pipes and inlets 20 mm: use for toilet accessories or cable ducts; Steps: Step 1: First, lean slightly at the oblique angle, the smaller the force, the less slippery, and the crescent-shaped positioning groove will open at high speed throughout the process; Step 2: Slowly build up the hole opener and shake it while punching to expel the dirt faster and increase the punching speed; Reminder: Adding water during operation can extend the life of the hole opener. Specifications: Color:as shown Material: emery + steel Installation thread: M14 Emery height: approx. 14mm Drilling depth: approx. 40mm Total length: about 60mm Number of hole openers: 6 pieces Hole Opener Size: 20mm 35mm 40mm 45mm 50mm 68mm Package list: 6PCS M14 drill bits Memory: 1.All the pictures have been professionally color-calibrated, but due to the different environment settings and different display devices, the pictures you see and the items themselves may have some deviations, please understand. 2.The data are all measured manually, there may be some error, but it does not affect the use.