This is an engraving bit set from GodHand. Inside the protective hard plastic case, you will find 5 ROUND bits of increasing size. 1.0mm – 3.0mm. The shank is 3mm in diameter which means these will work in any handle that holds 3mm round bits. They can be used by hand without a handle but they are so sharp that I don’t recommend it. Pro Tip: Flip the bit over to use it as a chisel. Use with adult supervision! Handle not included.