The Foredom® #30 General Purpose Handpiece has prefabricated ball bearings that do NOT require any additional lubrication. Comes with a chuck key in molded plastic handle for changing accessories. Replacement chuck keys are available separately. 5 3/16" long. 1" diameter. Various bench top tools attach to this versatile handpiece, such as the Foredom® drill press, Angle Grinder Attachment, Right Angle Collet Adapter, Belt Sander Attachment, Filer, Handpiece Holder, and AllSet® Stone Setting Kits.