16-piece drill chuck and brass collet set for versatile drilling - Includes 16 components with 11 brass collets sized from 5 mm down to 3.2 mm to cover common drilling needs - Secure holding capacity with an M8 x 75 mm drill chuck designed for safety, featuring stable construction and an integrated spring to hold small bits securely at high speeds, outperforming plastic models - Four larger-diameter brass collets provide firm grip and versatility for different applications - Steel alloy nut offers durability and wear resistance, improving overall accuracy when used with the brass collets - Designed for standard drills that use an M8 x 75 mm chuck Use scenarios - Precision drilling in metal, wood, or plastic parts that require tight bit retention and accurate hole sizes - Hobbyist projects, electronics housings, and model work where multiple bit diameters are needed - General workshop tasks that demand reliable bit grip and stable performance at high rotational speeds