Shank taper accuracy AT3 or better.
Made of alloy forged steel for long, durable service life.
Hardened to RC 52-56 and ground to wnsure maximum accuracy.
Face is held perpendicular to centerline within 0.0002".
Pilot diameter is siezed for precision fit with cutter and is keyed for positive drive.
Heavy duty locking RH nut and 5 arbor spaces are included - 1/16", 1/8", 1/4",3/8",3/4".
Retention Knobs are sold separately.