Techniks 29204 | CAT40 Taper x 4.00mm Size x 44.45mm Diameter x 100.00mm Projection Length x 168.25mm OAL Steel ShrinkFIT HolderTechniks 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. Techniks ShrinkFIT holders have T. I. R. of 0. 0001" or better. Balanced to 25,000 RPM at G2. 5 tolerance. Ideal for high speed or high torque machining applications.