Diamond Finger Milling Bits are exceptionally versatile tools that can handle detailed work on a range of hard surfaces. With this bit, you can open up existing holes without the risk of cracking or damage to the material. Perfect for tile edges, countertops, faucets, shower heads, and more! This finger milling bit also helps create round side indentations necessary for pipes, electric wires lines, and outlets. Available in four different sizes: 3/8″ (10mm), 5/8″ (15mm), 3/4″ (20mm), and 1″ (25mm), our milling bits are compatible with any 5/8″-11 thread standard grinder, making them an essential tool for any tiling project.Available in 4 different sizesIdeal solution to enlarge, shape and open up existing holesDesigned with 5/8″-11 thread shank to fit a grinderCan be used on a regular drill using our drill adapter