3PCS HSS Drills Set Tin-Coated Straight Flute HSS Step Drill Bits with Hex Shank (SED-SD3-TCS)

3PCS Tin-Coated straight flute HSS Step twist Drill Bits with Hex Shank

1. Material: HSS M2
2. Thermal treatment: Bit part 62-65HRC
Bit shank 40-50HRC
3. Surface treatment: bright white,Black Oxide, Titanium Coated, Cobalt Coated, TiALN Coated
(The surface of the drill bit without tipping blunt crack significant bump and grinding burn and influence the use performance defect, Product no surface rupture, burr, rust, black spots or other undesirable phenomenon)
4. Shank:hex shank. All shank with 1/4" quick change hex shank or 3/8" quick change hex shank prevents slipping in drill chuck or bit extension.
5. Flute type: straight flute
6. for drilling cylindrical holes in solid material up to a thickness of 1/8".
7.Burr-free and vibration-free drilling.
8.The tapered cutting edges of the next drill step can be used for simultaneous deburring or chamfering of the finished bore at the same time.
9.Drilling perfectly round holes in steel, brass, copper, aluminum, wood and plastic.
10.Drills up to 1/2" holes sizes with one bit.
11.Ideal tool for sheet metal workers, electrical contractor, auto mechanics, and general contractors.