4 PCS Diamond Drill Bits 8mm 5/16 Inch Ceramic Diamond Set for Ceramic Tile Porcelain Granite Stone

Length: 65mm (2 1/2 inch) Hex Diameter: 10mm (3/8 inch) Hex Shape: Triple-cornered colour: gold Material: Diamond Size: 65.8mm Package Contents: 4 x 8mm Diamond Drill Bit Note: 1. At first drill slowly at an angle of 45 degree (at low rpm). When the groove appear then drill it in vertical position.(Donot use impact drill setting) 2. Shake the drill slightly when punching which is convenient for removing waste chips and increasing speed. 3. It would be better keep on adding water when punching.(Or dip bit in water .) 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.