Specification: Material: high quality steel, diamond dust coating Color: Gold Size: 6mm-80mm(0.23"-3.15") 6/8/10/12/14/16/18/20/22/25/28/30/32/35/38/40/45/50/55/60/65/70/75/80 (mm) Features: 100% brand new and high quality. Good performance:diamond dust coating offers superior performance and cutting strength. Opening neat, smooth, no broken edges, no tremor phenomenon, chip Easily. Small incision resistance,feature drilling stably, fast speed, not breaking the border. Wide application: coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or other materials and only needs water for lubrication. 24 SIZES: No matter which size hole you want, it can always drill a perfect hole for you. How to Use Hole Saw drill correctly: Step1:Use pen to mark start of hole£¬and keep wet with WATER or COOLANT. Step2:Angle drill 45 degrees to start hole, and being drilling at low speeds.Angle drill to vertical position once the hole has started. Step3:Minimum pressure.Slow speed down for exit hole or drill from the other side to prevent breakthrough. Note: If you smell burning, back off! Either your speed is too high or the pressure you're applying is too much. You're drill bit should never be hot to the touch, not even warm. Slowest speed Always use lubrication (water) Minimum pressure Package Included: 6-80mm Diamond Hole Saw
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