Product Description 11 DegreeTungsten carbide Taper button drill bit/drill bits for rock drilling tools Made with high quality of raw material through special heat treatment, widely applied in Hand Hole(short-hole) drilling system for dimensional stone quarrying. Tapered button drill bits are widely used for drilling hard or very hard work. They are mainly equipped on rock drilling equipment, well drilling equipment and oilfield equipment At now, we are exporting the huge quantity of 30mm-42mm for South Africa Platinum mine, Nepal and Chile quarry. Details: Min. Order Quantity: 10 Pieces Supply Ability: 60000Pieces Button shape: Spherical, Hemispherical, Ballistic, Parabolic Skirt: Long skirt, Short Skirt. Taper degree: 4°, 6°, 7°, 11°, 12° Package: In wooden case or in carton Shank Hex. Size: 19mm, 22mm, 25mm Advantage 1).professional manufacture 2).stable and reliable quality 3).all products go through in-process and final inspection 4).free online technical service available 5).Sample available 6).Material-tungsten carbide & Cobalt 7).high stability,long life circle 8).good abrasive and corrosion resistance 9).high quality and high hardness 10).purity without recled materials 11).with coating or uncoating