Mini HSS Twist Drilling Bit Straight Shank Electrical Drill Tool.Straight Shank Twist Drill Bit.Infinitely adjustable - secure closure every time.Suit for:PCB,Thin Aluminum/Iron Sheet,Thin plank,Plastic.Color:silverMaterial:steelShank:Straight ShankOutside Diameter:0.5mm-3mmSize:Diameter of Head (A) (mm) Diameter of Shank (B) (mm) Length of Blade (C) (mm) Total Length (D) (mm) Quantity(pc) 0.5 0.5 6 23 5 0.6 0.6 10 25 5 1 1 15 35 3 1.2 1.2 20 40 2 1.5 1.5 20 40 2 1.8 1.8 20 45 2 2 2 25 45 2 2.3 2.3 25 55 2 3 3 35 60 2Package Contents:25pcs * 0.5-3.0mm Twist Drill BitOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.