Proper accessories: silver chuck length is 2.7 inches, compatible with drill bits from 0.3 mm to 6.5 mm; black chuck length is 1.97 inches, compatible with drill bits from 0.3 mm to 3.6 mm. Easy to use and install. Safe and efficient. Includes a 1/4-inch hexagon wrench. Features: These keyless drill chucks allow conversion of a cordless electric screwdriver into a drill or grinder. Adjustments are made by turning the tail for quick task switching and uninterrupted workflow. Essential power tool accessories. Easily lock and release drill bits for fast conversion between driving and drilling. Converts hexagonal shank drivers to drilling setups. Compatible with hex-shank power tools and standard drill bits. Wide range of applications: Designed to fit most drills and cordless power screwdrivers. Suitable for use in automotive, garage, warehouse, office, and home environments. Easy loading and unloading: This keyless drill chuck converter enables rapid transition from driving to drilling. Allows one-handed operation—ideal for tight spaces. Material: Metal Color: Silver and Black Package Contents: 1 × Silver hex shank chuck (0.3–6.5 mm) 1 × Black hex shank chuck (0.3–3.6 mm) Note: Color may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.