3.17MM Miniature electric drill drill chuck self-tightening

Specifications: copper drill clip 1 + 5 copper chucks + 1 small wrench, copper collet size is (0.5mm, 1.0mm, 1.5mm, 2.5mm, 3.0mm / 3.2mm)
It is suitable for 0.5-3.0MM drill bit and is matched with drill bit to form hand drill or electric drill. It can be used for punching ABS board, light board, cardboard and so on. Can also be used for other purposes