3Pcs/Set 3-12Mm 4-12Mm 4-20Mm Hss Straight Groove Step Drill Bit Coated Wood Metal Hole Cutter Core Drilling Tools Set
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Customer Reviews
*Note: Some reviews have been processed by Google Translate!DIY Supplies: Woodworking
Type: Center Drill Bit
length: other
Model Number: drill bits
Material: High Speed Steel
Use: Metal Drilling
is_customized: Yes
Certification: CE
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function: Milling cutter for wood,Hammer drill,Power Tools,Metal drills,Bit for electric screwdriver
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.
6 sided shanks design in order to prevent slippage when in 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.
Rotating Speed
4-12 speed:260-400
4-20 Speed:180-240
Suitable Material
Workpieces with general hardness, such as wood, plastic, PVC plate, iron plate, plate thickness within 3MM. Please note that stainless steel and spring steel are not applicable. Not for quenching. (Water injection cooling while working, it can effectively extend the service life of the drill bit, especially in the case of continuous drilling)
Attention
Because of 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 easily 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.
Length
3-12mm Length: Approx. 7.9cm/ 3.11"
4-12mm Length: Approx. 6.7cm/ 2.64"
4-20mm Length: Approx. 7.4cm/ 2.91"
Package Includes
1 x Drill Bit 3-12mm
1 x Drill Bit 4-12mm
1 x Drill Bit 4-20mm
1 x Bag
