【2 SIZE IN 1】2 different diameters in one package: Black 6mm, 8mm. In addition, 2 pieces diamond drill bits are placed in 2 separate plastic boxes, which you can find and use easily. 【Easy Operation】Applied for DRY or WET drilling. You can work in any conditions. The perfect tools are at your fingertips. You can also do the same great job as a master! 【Multiple Applications】Perfect for porcelain, glass brick, ceramic, ceramic tile, granite, marble, quartz, limestone, fiberglass terrazzo, masonry, quartz stone and sandstone. 【Reasonable Size】For 6mm/8mm, Thanks to the sharp and extremely hard diamonds, the diamond core bit ensures professional clean and fast drilling. Thanks to the high-quality industrial diamonds, the core drill bit has a fast cutting speed. 【High Quality】Thanks to the sintered diamond segment and the maximum precision, the cup wheel has a long service life. Sintering achieves high fracture toughness, making the diamond material less susceptible to shock. It has