3pcs Drill Bit HSS 3-12mm 4-12mm 4-20mm High Speed Steel Titanium Hex Shank Step Drill Set Metal drill bit wooden drill bit

Hex shank straight groove step drill

1. Unique stepped structure, one drill bit can open a variety of sizes and apertures, and one stepped drill hits a box of drill bits.

2. No need to use center punch, which is not easy to break compared with ordinary twist drills. On site construction, a ladder drill is suitable for multiple specifications.

3. It becomes possible to remove burrs, chamfers, expand elliptical holes, and twist drills.

4. Compared with ordinary twist drills. It can open beautiful apertures without shaking, without leading the center punch.

5. Use tools: pistol drill and bench drill. Water cooling while working, can effectively extend the life of the drill bit, the recommended drilling speed is 250-400 rpm. Cutting material: thin iron plate, aluminum, insulation board, PVC board wood thickness within 5mm. A single bit can be used to punch holes of various sizes. Material: High-speed steel 4241 (suitable for workpieces with hardness below 25 °, such as carbon steel)

Finish: Titanium

Length:

4-12mm Length: Approx. 6.7cm/ 2.64"

4-20mm Length: Approx. 7.4cm/ 2.91"

4-32mm Length: Approx. 10.2cm/ 4.02"

The 3 Cutters Come in the Following Sizes:

3-12mm (3mm, 4mm, 5mm, 6mm, 7mm ,8mm ,9mm ,10mm, 11mm ,12mm)

4-32mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 2mm)

4-20mm : 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 14mm, 16mm, 18mm, 20mm

4-12mm (4mm, 6mm, 8mm, 10mm, 2mm) Packing list:3 * Step Drill Bit With Bag