4/5/6/8/10mm 5PCS M35 HSS-E Cobalt Drill Bits Heavy Duty Step Twist Drill Kit for Hardened Steel & Iron Hole Drilling

Family version：Can meet the normal drilling needs of the family

Upgrade version：The stability is very good. Suitable for use by construction workers and industrial applications

Product Description

This 5-piece titanium-coated twist drill set includes sizes of 4mm, 5mm, 6mm, 8mm, and 10mm. It is made of high-speed steel and is sturdy and durable. The optimized spiral grooves enable smooth chip removal, and the sharp and precise tip ensures clean and accurate holes. It is compatible with most electric drills and is ideal for drilling on wood, soft metals, and plastics. It comes with a portable storage box for easy organization and carrying, making it perfect for DIY home repairs and light industrial projects.

Proper Usage Instructions for Twist Bit Drill Heads

Select the appropriate drill bit size, firmly clamp it into the drill chuck and tighten it to prevent slippage.

Mark the drilling position on the workpiece first, secure the workpiece to avoid movement during drilling.

Start drilling at a low speed with gentle pressure, keeping the drill bit perpendicular to the workpiece surface.

When cutting deep holes, periodically pull out the drill bit to remove chips and reduce overheating.

Pause the drilling before penetrating the material to prevent edge cracking.

Wear safety glasses during operation; if the drill bit gets stuck, stop immediately and do not forcibly rotate it.