- Quick-change, tool-free drill chuck: easily holds accessories with shank sizes from 1/32 in to 1/8 in. No extra tools or keys required to swap bits quickly and smoothly. - 10 sizes of brass collets: 5.0 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.4 mm, 3.0 mm and 3.2 mm. Provides versatility for different drilling needs. - Robust alloy construction: the chuck and collets are made from alloy material for durability. Compared with plastic models, they offer greater safety and reliability for your drilling projects. - Well-made 3-jaw chuck: engineered for smooth operation and secure grip. A built-in sturdy spring delivers strong retention and supports long-term use without compromising performance. - Practical applications: suitable for handheld drills in wood, plastic, or metal requiring small diameter holes; ideal for electronics, jewelry making, and model work with tiny drill bits; enables rapid bit changes during projects or in drill press setup for quick size switching.