New and high quality.This set replaces 50 individual drill bits. Two-flute design gives you faster, smoother cutting.3-sided (TRI-FLAT) shank will not slip in your drills chuck.Cobalt coated Compatible With smoother cooler cutting.Titanium coated to reduce friction and run cooler.Large bit has 3-sided shank and small bits have hex shank 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 to 1/2 6 Steps (3/16, 1/4, 5/16, 3/8, 7/16, 1/2)2: 1/8 to 1/2 13 Steps (1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32 , 1/2)3: 1/4 to 3/4 9 Steps (1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4)4: 1/4 to 1-3/8 10 Steps (1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/8, 1-1/4, 1-3/8)5: 3/16 to 7/8 12 Steps (1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8)Drill1/4-1-3/8Shank Diameter9mmDrill3/16-7/8Shank Diameter9mmDrill1/4-3/4Shank Diameter9mmDrill1/8-1/2Shank Diameter6mmDrill3/16-1/2Shank Diameter6mmMaterial: fast working steel Package included:1 x 1/4-1-3/8 Step Drill1 x 3/16-7/8 Step Drill1 x 1/4-3/4 Step Drill1 x 1/8-1/2 Step Drill1 x 3/16-1/2 Step Drill1 x Aluminum BoxNote: Light shooting 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.