Step Drill Bit 3-12mm 4-12mm 4-20mm HSS Straight Groove Titanium Coated Wood Metal Hole Cutter Drilling Power Tools Set

Features:

Made from high quality HSS steel.

Ideal for using to cut holes in a variety of materials including brass, wood, plastic, etc.

3Pcs Hss Drill Bit Set, quality tool for jobs of all sizes.

Titanium coated to reduce 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:

3-12 speed:260-400,

4-12 speed:260-400,

4-20 speed:180-240

Suitable material��Workpieces with general hardness, such as wood, plastic, PVC plate, iron plate thickness within 3MM. Please note that stainless steel and spring steel are not applicable. Not for quenching.

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. 6.5cm/ 2.56"��

4-20mm Length: Approx. 7.7cm/ 3.0"��

Hexagonal handle diameter: 6.35mm

Package include��

1 x 3-12mm Drill Bit��

1 x 4-12mm Drill Bit��

1 x 4-20mm Drill Bit��

1x Bag