Replacement Brass Collet Material and durability Most market collets are aluminum alloy, which is soft and wears easily. This product uses a brass allmetal construction. Brass provides better hardness and wear resistance, and eliminates the common issue of plastic nuts breaking during use. Compatibility Compatible with all rotary tools and flex shafts. Not compatible with discontinued Models 1, 2, and Series 1 or earlier of discontinued Models 260, 270 and 280. Performance and benefits This replacement brass collet holds tiny bits much more securely and aligns them better with the tool rotation. At speeds, it maintains stability and reduces runout, contributing to more efficient work. Use scenarios Jewelry making and precision work with micro burrs and small drill bits. Model making and fine woodworking that use tiny cutting or grinding bits. Electronics prototyping, PCB work, and other projects requiring micro drill bits. Key attributes Function: secure, precise holding of small bits during speed operation Material: brass allmetal construction for durability and reliability Compatibility: works with most rotary tools and flex shafts (excluding listed discontinued models) Performance: improved alignment and reduced wear leads to better efficiency and consistency