3-12mm/4-12mm/4-20mm Hss Step Drill Bit, Straight Groove DrillTitanium Coated Metal Driller, Drilling Tools Set

Product Introduction

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 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 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 dril, 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

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, lf 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.

Suitable material: Work pieces 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)

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"

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

Package included:

3pcs(1pc 3-12 + 1pc 4-12 + 1pc 4-20) in cloth bag