3pcs 3-12/4-12/4-20 mm Step Drill Bits High Speed Steel Cone Titanium Coated Tool Sets Hole Metal Cutter

Material: high-speed steel 4241 (suitable for use in general hardness workpieces, such as aluminum, Wood Board,plastic,sheet metal that thickness below 5MM

Deburring, chamfering, and opening oval holes

Step structure, a drill can open a variety of sizes aperture

Ideal for using to cut holes in a variety of materials including aluminum, Wood Board, plastic,sheet metal, PVC board, insulation board

Power Cutting & Sawing

This step drill bit is durable and strong enough to punch and drill clean holes in materials like metal, wood, etc.. It can also help to enlarge existing holes and clean edges.

It is Great for drilling holes for iron, metal, aluminum, copper, wood, plastic, PVC board and many other types of sheets.

Suitable for hand-held drilling rigs, drilling machines, milling machines and machining centers, for metal sheet, maintenance and modification, bridge doors and windows, home appliances, etc..

Note: High temperature will affect the working life, please use coolant while drilling on metals to ensure the drill bit working properly. Please keep it properly preserved. Avoid falling the bits from high place.