1)parallel shank drill bit 2)Standard size 3)Material:hss 4)Coated:bright,black oxide 5)High precison 1.Material:High speed steel,carbide2.Size:Standard 5-50mm3.Packing:plastic box4.Surface finishing:black oxide,bright finished5.Good machinability, wear-resistant teeth, higher precision and durable in useIf you are interested,pls feel free to contact us for more details. Website: http://www.xyc- ...