3/32" (2.35mm) shank mandrel to fit all of our diamond discs. Mandrel is 1 3/4" (44.45mm) in length. Remove screw from mandrel head. Slip screw through the arbor hole in the disc and securely tighten screw in the mandrel. Friction from screw holds disc firmly in place. 3/32" shank will fit most adjustable chuck drills and rotary tools. Availability: Usually ships in 2-3 business days. 3/32" Mandrel for Diamond Discs MA-1$2.45 Thank you for visiting A&M Instruments, Tools and Machining. Please e-mail any suggestions or comments to improve the site, our service, or tool selection. Always wear proper eye protection and gloves when using any cutting or grinding tool. ALL diamond tools last longer if a lubricant or coolant is used during cutting or grinding. Copyright® 2002-2006 A&M Instruments Inc 1-866-264-4287