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 for secure attachment. Features: These keyless drill chucks convert cordless screwdrivers into drills or grinders. Adjustments are made by turning the rear collar to quickly switch between tasks and maintain workflow. Essential power tool accessories. Easily lock and release drill bits to convert between driving and drilling. Compatible with hex shank drivers and standard drill bits. Wide range of applications: Suitable for most drills and cordless screwdrivers. Ideal for use in automotive, garage, warehouse, office, and home environments. Easy loading and unloading: This keyless chuck allows quick conversion from driving to drilling in seconds. Enables 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: Actual product color may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.