Premium Tapered Button Bit for Mining, Quarrying & Rock Drilling Brighttop Global Co., Ltd Tapered Button Bits are manufactured from premium alloy steel and high-grade tungsten carbide inserts to deliver exceptional drilling efficiency, durability, and wear resistance. Designed for mining, quarrying, tunneling, and construction applications, these bits provide fast penetration rates and reliable performance in medium to hard rock formations. Available in 6°, 7°, 11°, and 12°