Feature

●Shank Type: 6mm Hex Shank; Material: HSS 4241 with Titanium Coated; Drilling Diameters: 4mm/0.16", 6mm/0.24", 8mm/0.3", 10mm/0.4",12mm/0.47", 14mm/0.55", 16mm/0.6", 18mm/0.7", 20mm/0.8".
●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.

Description

Step drill bits are designed to enlarge a hole as the bit drills through the sheet metal, wood, plastic, or PVC board. Each step on the bit is larger in diameter than the step before. Smaller step drill bits are self-starting and no pilot bit is required to start the hole. On larger step drill bits, you need to have a hole pre-drilled that is equal in diameter to the smallest step on the bit.

About High Speed Steel(HSS)

HSS-4241:

Suitable for workpieces with hardness below 25HRC, such as iron plate, aluminum plate, PVC plate.

HSS-6542:

Suitable for workpieces with hardness below 28HRC, such as iron plate, aluminum plate, metal sheet and copper plate.

HSS-CO/M35:

Suitable for workpieces less than 5mm thickness, such as iron plate, aluminum plate, metal sheet, or workpieces less than 1mm thickness of stainless steel.

Note: While drilling on 304 stainless steel, thickness under 1mm you can use a hand drill with power above 800W, thickness between 2-3mm will require a bench drill with speed below 500 rpm.