[Exquisite craftsmanship] These diamond drill bits are made of industrial-grade carbon steel, and the nickel-plated coating can resist . The thickened diamond coating on the top has excellent cutting strength, enabling high-precision and smooth cutting without curling, achieving the maximum drilling effect. [Ergonomic design] The large clearance hole on the drill bit helps the cooling water enter and the chips and other particles in the hole escape, ensuring smooth drilling and making the drilling process easier. Small holes-when debris gets stuck in the hole saw. pull it out with a screwdriver. Provide you with a perfect experience. [Adjustable device] Adjustable hole saw drilling guide fixing device with suction cup-The maximum opening length of the board is 3-1/4 inches (about 8.9 cm), which is large enough to fit all hole saws of all sizes. Removable , two modes (fixed 3 or 4 bearings), just flip the plate. [Different sizes] This diamond hole saw set is equipped with 10 different drill bits to meet needs. Including the following diameters: 6 mm, 8 mm, 10 mm, 12 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 50 mm, 10 hole saw bit + 1 hole saw guide clamp + 1 screwdriver. [Perfect choice] This diamond-coated hole saw bit can be used to remove rings on glass, marble, ceramic tiles, ceramics, PVC or other materials. When the drill is working, please continue to add water to reduce the drilling speed, reduce the drilling pressure, increase the water lubricity, and greatly extend the service life of the drill. Tip: 1. Not suitable for concrete or concrete than 1/2 inch. 2. If you smell a burning smell, please step back! Too fast or too stressful. 3. Water should be used as a lubricant and coolant when drilling, which will greatly extend the life of the drill. Colour: orange, silver Material: high-speed steel Package Contents: 10 * Hole saw bits 1 * Hole saw guide clamp 1 * Screwdriver Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.