Step Drill Bit Set with Automatic Center Punch,HSS High Speed Steel Titanium Coated Home Improvement Workshop Industrial 6 Pcs Sets

• This drill is made of high speed steel,so itsThe blade teeth are sharp and durable, and the opening is smoother
• Special step drill bit for electric wrench, with large torque, strong bearing capacity and not easy to break
• Wideiy use, the drill can be used for stainless steel, die steel, aluminum alloy, PVC, copper, cast iron
• The double spiral groove reduces the cutting resistance, speeds up the chip removal speed, strengthens the chip removal groove, and effectively blocks the damage caused by metal chip splashing
• If you have any questions, please contact us immediately, our customer service staff will solve your problems as soon as possible.

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 including: 1 x 1/4-1-3/8 Step Drill 1 x 3/16-7/8 Step Drill 1 x 1/4-3/4 Step Drill 1 x 1/8-1/2 Step Drill 1 x 3/16-1/2 Step Drill 1 x Aluminum Box