Professional burr set for commercial or occasional use 6pc micro HSS burr set use HSS bits for maximum strength and durability use Suitable for polishing, grinding, shaping and to burnish wooden surfaces use Also used for processing of metallic and non metallic surfaces use Perfect for craft work or various engraving jobs use Suitable for use in any micro drill / die grinder use Shank diameter is 3.17mm (so suitable for micro drills with compatibility for an 1/8" chuck) use 6 different shape burrs to cater for all needs and requirements use Total length of the burrs is 40mm use Various forms of cutting part provide efficient processing of materials use