PFERD Reamers & Countersinks Countersink 609863 - PFERD 25203103, Pferd manufactures the FLS HSS DIN 373 11,0 F countersink, which is a high-speed steel tool designed for creating precise chamfering in holes. This 11 mm countersink bit is known for its durability and precision in metalworking and woodworking applications. Ideal for both professional machinists and hobbyists, it's suitable for a wide range of machining tasks. PFERD 25203103 Countersink 11 mm HSS ideal for fine-grade through holes