These hex shank de-burring countersinks from FISCH have three sharp edges ground into the fully hardened material, keeping the working temperature low. In contrast to standard milled countersinks the chip removal is superior, again making for an excellent quality finish. They can be used on a wide range of materials including high grade steel, synthetics, wood and both alloyed and non-alloyed steels. Part of our Quick Change System each shank is hardened and conforms to DIN3126.E6.3. Size 5-16mm. Made in Austria.