Features:_x005F_x000D_- This Item ia brand new_x005F_x000D_- 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_x005F_x000D_- Ti coated to reduce friction and run cooler_x005F_x000D_- Large bit has 3-sided shank and small bits have hex shank to prevent slip in drill chuck_x005F_x000D_- Automatically deburrs holes as you drill_x005F_x000D_- Long Life high speed steel_x005F_x000D_- Includes protective padded aluminum case_x005F_x000D_- Package Size:15cm*10.5cm*4.2cm(L*W*H)_x005F_x000D__x005F_x000D__x005F_x000D_Sizes:_x005F_x000D_#1: 3/16" to 1/2" 6 Steps (3/16'', 1/4'', 5/16", 3/8'', 7/16'', 1/2'')_x005F_x000D_#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'')_x005F_x000D_#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")_x005F_x000D_#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")_x005F_x000D_#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")_x005F_x000D__x005F_x000D__x005F_x000D_Package included:_x005F_x000D_1 x 1/4-1-3/8 Step Drill_x005F_x000D_1 x 3/16-7/8 Step Drill_x005F_x000D_1 x 1/4-3/4 Step Drill_x005F_x000D_1 x 1/8-1/2 Step Drill_x005F_x000D_1 x 3/16-1/2 Step Drill_x005F_x000D_1 x Aluminum Box 1Made of ti-coated high-speed steel, these hex shank step drill sets have high hardness. 2The step s adopts groove design, help the electric drill clamp it more firmly, prevent sliding or falling off during rotation. 3It is very suitable for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc. 4Cobalt coated for smoother cooler cutting, automatically deburrs holes as you drill. 5Using high?quality materials, strong and durable, has a long service life.