Diamond tapered tile drill bits are designed for trimming, enlarging, shaping, rounding and beveling existing holes in ceramic tile, porcelain, and marble. The tapered drill bit is great for improving the edge of exposed holes, reducing the risk of cracking in standard and large size tiles that are under tension (e.g. tightened pipes, LED lights, etc.), the bevel easily chamfers and relieves rough holes in glass, ceramic and porcelain tiles. Use our tile cutting tool to enlarge existing holes to different sizes or shapes without having to buy multiple core drill bits, which a lot of money! Angle Grinder 5/8-11 Thread. This is not a diamond drill bit for drilling holes. It not make holes, but it bevel holes to clean and reinforce edges if they are chipped or need cleaning Colour:Orange + Silver Material:High manganese steel + corundum Package Contents: 1 set of Ceramic floor tile hole expander Only the above package content, other products are not included. Note: Light reflection 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.