Premium DWDTN Series #4 Tin-Coated Drill Bits (12-Pack) - High Speed Steel for Metal, Wood & Plastic - Perfect for DIY Projects, Home Repairs & Professional Workshops

Superhard titanium nitride surface treatment improves drill life, chip ejection, and productivity; decreases horsepower requirements. Ideal for hard metals, work hardened stainless and other difficult to drill materials.

High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance

Titanium nitride coatings add a hard layer of gold-colored ceramic to the surface that extends tool life and permits faster cutting speeds than uncoated tools

Round shanks allow use with a wide variety of toolholding systems

When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging

Ideal for hard metals, work hardened stainless and other difficult to drill materials