Extension Attachment Bit Set: 225-piece versatile rotary power tool attachment bits for high-speed, small-scale cutting, engraving, grinding, cutting, polishing and more. Maximize your drill accessory kit to get the most out of your rotary tool to get the results your craftsman needs and deserves. Craft Uses and DIY: Whether doing repairs and maintenance, or working on small, delicate jobs, this is an essential craft for any precise and passionate DIYer - start this project now. Rotary tool compatibility: Supplied with 4 brass collets: 1.5, 2.3 and 3.2mm (with spare) Almost incompatible with most other popular brands of rotary tools for installation.< /p> Accessory polishing bits are neatly stored in a c-shaped tray holder arton lightweight, keeping them packed and easy to find when working. Compact size fits perfectly in most tool drawers and is always available Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.