RS PRO HSS Drill Bit 21 mm Head Diameter, 90° Countersink Angle, 65 mm Length, 7.15 mm Shank Diameter 423-850

RS PRO 423-850 is a high-quality HSS drill bit designed for industrial and mechanical drilling tasks requiring precision and durability. Featuring a 21 mm head diameter and a 90° countersink angle, this bit is optimized for countersinking applications in metalworking, fabrication, and maintenance.

The drill bit is made from premium high-speed steel (HSS), providing long-lasting sharpness and excellent heat resistance. The overall length of 65 mm and a shank diameter of 7.15 mm ensure compatibility with a variety of power tools. Its 1/4" hexagon shank delivers excellent grip and stability in three-jaw chucks, preventing slippage during use.

This drill bit is ideal for industrial, manufacturing, and maintenance environments requiring reliable and precise drilling components. It can be used in metal drilling, countersinking, and other precision drilling applications.

The high-speed steel composition facilitates efficient cutting and enhanced durability. 90° countersink angle enables smooth countersinking and chamfering. 65 mm overall length for effective penetration and reach. 7.15 mm shank diameter fits standard drill chucks securely.

1/4" hex shank ensures non-slip, stable positioning during drilling.

Manufactured in China, this product does not have specific certifications or approvals but is built to RS PRO standards for quality. A single piece drill bit set is supplied, ideal for workshop and field use.

Explore more RS PRO power tool accessories and drill bits in EnvMart’s dedicated sections for industrial power tools and accessories.

Explore more products in our Countersinks category.