3-12mm 4-12mm 4-20mm Step Drill Bit HSS Titanium Coated Hex Shank Core Drilling Tools for Wood Metal Hole Punch

Features:
• 100% Brand New and High Quality
• Made from high-quality HSS steel
• Ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc.
• Titanium coated to reduce mit and heat
• Heat treated and highly polished. Drills perfectly round holes in steel, brass, plastic, wood, etc.
• 3 sided shanks design in order to prevent slippage when in the chuck
• Two flute design drives faster, smoother and cleaner cuts each step is clearly labeled with the depth diameter in steps

Function: Deburring, Chamfering, Cutting or expanding holes
Supporting tools: Pistol drill, Hand drill, Charging drill, Bench drill. (Water injection cooling while working, it can effectively extend the service life of the drill bit, especially in the case of continuous drilling)
Rotating speed:
3-12 speed:260-400
4-12 speed:260-400
4-20 Speed:180-240

Notice:
• Attention: Because the outer diameter of each step of the step drill is gradually expanded, then the corresponding cutting resistance and linear velocity will also be gradually increased.
• Owing to the step drill is completely dependent on the inclined edge that is only with 1mm length, If the feed speed is too fast when drilling, it will be easier to be annealing caused by abrasion of the oblique edge.
• Please give a downward force when drilling, do not press down too hard to avoid the edge wearing.

The Cutters Come in the Following Sizes:
3-12mm: (3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm) 10 Steps
4-12mm: (4mm, 6mm, 8mm, 10mm, 12mm) 5 Steps
4-20mm: ( 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm）9 Steps