Techniks 17834 | BT40/ANSI Taper x M16 Size x 12.50mm Diameter x 45 Degree Tool Steel Thread Retention KnobTechniks mission is to provide high quality and innovative solutions that optimize manufacturing processes for customers engaged in metalworking, composites machining, and woodworking to meet the most challenging applications, improve machining processes, and create cost efficiencies. All mating surfaces are precision ground. Manufactured to the highest standards for maximum safety and long life. Hardened for maximum longevity. Product Specifications