Features:- This Item ia brand new- This set replaces 50 individual drill bits. Two-flute layout gives you faster, smoother cutting. 3-sided (TRI-FLAT) shank will not slip in your drill's chuck. Cobalt coated for smoother cooler cutting- Ti 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- Package Size:15cm*10.5cm*4.2cm(L*W*H)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")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 Box.