21/64" HSS Drill Bit Long Series Carded 2500-21/64S by Bordo Metal Diamond Cutting|Abrasive Wheels and Cups Flex Handle 375mm (15")

Flex Handle 375mm (15")

With cutting edges (hardness approx

Increased Molybdenum Manganese and Nickel content provide greater strength and corrosion resistance

o Reversible Ratchet Handle 3/8"

The stocks are made of Rosewood / Walnut (depending on availaibilty at time of manufacture)

21/64" HSS Drill Bit Long Series Carded 2500-21/64S by Bordo Metal Diamond Cutting|Abrasive Wheels and Cups Flex Handle 375mm (15")BLACK FINISH (also called blue finish) A black finish is achieved by steam tempering, a thermal process resulting in a porous tool coating. This surface helps to keep lubricant on the tool, particularly important on the cutting edges, thus reducing friction and cold welding. The result is increased tool life. Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation. Specifications: