New and high quality.This set replaces 50 individual drill bits. Two-flute design gives you faster, smoother cutting.3-sided (TRI-FLAT) will not slip in your drill's chuck.Cobalt coated for smoother cooler cutting.Titanium coated to reduce friction and run cooler. bit has 3-sided and small bits have hex to prevent slip in drill chuck.Automatically deburrs holes as you drill. Long Life high speed steel. Includes protective padded aluminum case.Sizes:1: 3/16 inch to 1/2 inch 6 Steps (3/16 inch, 1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch)2: 1/8 inch to 1/2 inch 13 Steps (1/8 inch, 5/32 inch, 3/16 inch, 7/32 inch, 1/4 inch, 9/32 inch, 5/16 inch, 11/32 inch, 3/8 inch, 13/32 inch, 7/16 inch, 15/32 inch , 1/2 inch)3: 1/4 inch to 3/4 inch 9 Steps (1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch, 9/16 inch, 5/8 inch, 11/16 inch, 3/4 inch)4: 1/4 inch to 1-3/8 inch' 10 Steps (1/4 inch, 3/8 inch, 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, 1 inch, 1-1/8 inch, 1-1/4 inch, 1-3/8 inch)5: 3/16 inch to 7/8 inch 12 Steps (1/4 inch, 5/16 inch, 3/8 inch, 7/16 inch, 1/2 inch, 9/16 inch, 5/8 inch, 11/16 inch, 3/4 inch, 13/16 inch, 7/8 inch)Drill1/4-1-3/8 Diameter9mmDrill3/16-7/8 Diameter9mmDrill1/4-3/4 Diameter9mmDrill1/8-1/2 Diameter6mmDrill3/16-1/2 Diameter6mmMaterial: fast working steelPackage included:2 x 1/4-1-3/8 Step Drill2 x 3/16-7/8 Step Drill2 x 1/4-3/4 Step Drill2 x 1/8-1/2 Step Drill2 x 3/16-1/2 Step Drill2 x Aluminum BoxOnly the above package content, other products are not included.Note: Light reflection 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.