Keep your rotary tools working smoothly with this set of 8 quickchange keyless chucks — a practical replacement pack for worn, damaged, or missing chucks. Key benefits Pack of 8: multiple worn chucks or keep spares on hand to avoid downtime during projects. Keyless quickchange design: Swap bits and accessories fast without a chuck key, saving time and simplifying repetitive tasks. Universal replacement: Designed to be compatible with rotary tool models 4486 and models 3000, 4000, 7700, 8200 listed in the product title. Simple to install and use: Allows quick hand tightening and loosening so you can get back to work with minimal interruption. Costeffective maintenance: Replacing chucks individually can be costly; this multipack provides value for professionals, hobbyists, and DIYers. Key attributes Functionality: Quickchange, keyless chuck for fast accessory changes and secure holding of small bits used with rotary tools. Compatibility: Replacement specifically for rotary tool models 4486, 3000, 4000, 7700, 8200 as indicated in the product name. Quantity: 8 pieces included to cover multiple tools or to serve as backups. Typical use cases Precision crafting and jewelry work: Swap between tiny drill bits, burs, and polishing accessories quickly while working on detailed pieces. Model making and hobby projects: Change sanding, cutting, or engraving attachments without slowing your workflow. Small home repairs and maintenance: Keep a selection of heads ready for cutting, grinding, or drilling in tight spaces where quick changes improve efficiency. What's included Eight (8) multi quickchange keyless chucks, packaged as a replacement set for the compatible rotary tool models listed. This 8piece set is intended as a direct replacement option for users of the specified rotary tool models who need convenient, fast accessory changes and practical spare chucks for ongoing projects.