RUKO HSS Flat Counter Sinker with Fixed Guide for Thread Core Hole, DIN 373, Bright Finish, 15.0 mm Diameter, 100.0 Length, R102419

Amazon

To produce cuts for cylinder head bolts, hex bolts and nuts. Great for burr-and chatter-less sinks in steel, cast iron, non-ferrous and light metals. Great results at low cutting speed., Manufacturer: RUKO GmbH Präzisionswerkzeuge

ManoMano

For cylinder head screws, bolts and hex nuts. For steel, cast iron, non-ferrous metals and light metals. Best results at low cutting speeds.