The easy way to drill precision holes and create fine details without having to remove your ¾" or 1″ grinding head! Works with our 1/8″ (3 mm), 1/4″ (6 mm) 3/8″(10 mm) diamond drill bits. Drill precision holes and create fine details without having to remove your ¾" or 1" grinding head! Key features Standard 100# grit for multitask use Drill small holes quickly and easily Use to ...