[Best Choice]This diamond-coated hole saw bit can be used to remove rings on glass, marble, tile, ceramic, PVC or other materials. When the diamond bit is working, please continue to add water to reduce the drilling speed, reduce the drilling pressure, and increase the water lubricity, which will greatly extend the life of the bit Colour: silver + blue Material: metal Package Contents: 10 x hole openers (6/8 /10/12/20/25/30/35/40/50) 1 x adjustable hole saw guide device Tips: 1. Not suitable for concrete or concrete deeper than 1/2 inch. 2. If you smell a burning odor, step back! Too fast or stressed. 3. Water should be used as a lubricant and coolant when drilling, which will greatly extend the service life of the drill. Only the above package content, other products are not included. Note: Light shooting 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. About Us We provide the good product with the best price,we support Wholesale/Drop Shipping Order 1. For Drop Shipping order, please remark"dropshipping order", we will prioritize it. 2. For Wholesale/Drop Shipping orders, if you have any ideas about the price or package,please contact us in advance,we will give you the best service to satisfy your demands.