Manual drill， also known as a manual drill hole， hand twist drills， reamers and other， non-power tools， require manual operation.This product is aluminum， more durable than brass. Specification：Material：aluminumSize：120mm(L) 15mm(D)clamping shank diameter from 0.1-3.5mm.Include: 0.8mmx2 1.0mmx2 1.5mmx2 2.0 mmx2 2.2mm x2 Drillx1Feature：This product is aluminum， more durable than brass. Precise and durable， not afford to drill， not slip.Scope: timber， diamond， Pu Tizi， bones， horns， amber， olive， walnut， plastic and other materials drilling.Package include：1x drrll10x bits