90° Tri-Flat Shank Countersink Countersinks manufactured from premium quality high-speed steel for increased hardness/toughness, improved cutting edge strength and extended tool life. These counter sinks are designed for the production of 90° countersinks in most metals and features ground flats for positive location in 3-jaw chucks. Features and Benefits • Ground flats for positive location in 3-jaw chucks
• Universally suitable for many materials
• Can be used on soft ductile materials
• Manufactured from premium quality HSS