Features:* Brazed Dry Drill Diamond Drill Bits for Stone Ceramic Tile.* For Drilling Granite, Marble Masonry, Concrete, Tile, Ceramics.* Wax inside to cool dry drilling without water.* Very high efficiency, multi-function drilling, long drilling life.* Using Brazed Diamond Hole Saw, the power tool speed should not be lower than 2000 rpm/min, the faster the speed, the better the effect. The hole saw should not be pressed very hard, otherwise it is easy to damage the hole saw. Specifications:Product Name:Soldering OpenerMaterial: Emery, HCS Production Process: SolderingColor: Black, Silver Upper: 6.35mm Hex Shank Diamond Length: 10mm Size: 6mm, 8mm, 10mm, 12mm Suitable for: Drilling Granite, Marble, Concrete, Tile, CeramicOptional: 5pcs/set Package Contents: 5 x Soldering OpenerNote:1. Transition: 1cm=10mm=0.39 inch.2. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.3. Please allow slight manual measurement deviation for the data.