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 drill's chuck.Cobalt coated for 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 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.