Foredom A-M1L Mandrel, Left Hand Thread, Screw Type, 3/32" ShankA-M1L
For mounting wheels, stones, felt bobs, small buffs, and other unmounted accessories with 1/16" arbor holes. 1-3/4" overall length. 40,000 RPM Max Speed. Left hand threads hold the accessory securely and self tighten while running in reverse operation in flex shafts and micromotors. Notch on bottom of shank identifies this mandrel as left hand threaded.