Microbox shank drill bit set contains 10 drills for jewellery and model crafting the plastic index box keeps the drills securely in place and the sliding top dispenses one drill at a time you will find the perfect sized drill for all intricate holes in this selection to create your artistic vision10 piece drill kitsizes 05 06 08 10 12 13 15 18 20 and 22mmdrills can be replaced individuallymicrobox shank drill bit set 10 pack