This flex shaft is the perfect addition for your Rotary Tool amde with nylon and steel. * The maximum rated speed is 35000 rpm & Compatible with most rotary tools like Dremel, Wen, Roybi etc. * The maximum rated speed is 35000 rpm & Compatible with most rotary tools like Dremel, Wen, Roybi etc. * Keyless Chuck and 1/8 inch Universal Collet. * It is flexible and endurable, can be used garden machine and every kind of flexible transmission used equipment. * Quick connect - easily attaches to your Dremel rotary tool. * Application: Car, motorcycle, garden machine and every kind of flexible transmission used equipment. * This is to install on rotary tool, unscrew Collar Ring, aloosen collet nut, insert shaft into collet, tighten collet nut, and screw flexshaft onto the rotary tool. * Package includes: Flexible Flex Shaft polishing chuck for Dremel. * Shaft installation: 1) remove rotary tool collet nut, and rotary tool top cap. 2) slide collet nut onto shaft core. 3)insert shaft core into collet. 4) tighten collet nut. Make sure the shaft core is hold tightly in the tool. 5) screw shaft connector onto the rotary tool. This will ensure the shaft core push back into the shaft. * Bit installation instruction: 1) insert the L bar included into the hole at the collet side of the shaft. 2) unscrew the shaft collet nut. 3)insert bit, not included, into the shaft collet 4)tighten shaft collet nut. 5) remove the L bar.