Foredom A-SD328L Mandrel, Left Hand Thread, Rubber Drum, 3/32" ShankA-SD328L
3/32" shank, 1-3/4" overall length. 40,000 RPM Max Speed. Left hand threads holds the accessory securely and self tighten while running in reverse operation in flex shafts and micromotors. Notch on bottom of shank and black threaded screw tops identify this mandrel as left hand threaded.