Features: Flexible and durable, can be used for the most kind of small electric grinding. Use to install on rotary tool. First, unscrew collar ring and aloosen collet nut; then insert shaft into collet, tighten collet nut and screw flexshaft onto the rotary tool. Perfect for car, motorcycle, garden machine and every kind of flexible transmission used equipment. Specifications: Name: 42 Inch Flexible Flex Shaft Polishing Chuck Balance: +/- .003" tolerance Material: Alloy Steel Color: Black SizeShaft Length: 108cm Connecting Slotted Nut: 4 * 2cm / 1.58 * 0.79in (L * W) Slotted Nut Model: M18-M19 Transmission Shaft: 99 * 3cm / 38.98 * 1.18in(L * W) Package Includes: 1 x Electric Grinder Shaft Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you.