Proper accessories: silver chuck length is 2.7 inches, compatible with bit sizes from 0.3 mm to 6.5 mm; black chuck length is 1.97 inches, compatible with bit sizes from 0.3 mm to 3.6 mm. Easy to use and install. Safe and efficient. Includes a 1/4-inch hexagon wrench card for use with power screwdrivers. Features: These keyless drill chucks allow cordless electric screwdrivers to function as drills or grinders. 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 tasks. Converts hexagonal shank drivers into drilling rigs. Compatible with hex-shank power tools and standard drill bits. Wide range of applications: Suitable for most drills and cordless power screwdrivers. Ideal 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 in seconds. Allows one-handed operation, ideal for tight spaces. Material: Metal Color: Silver and Black Package Contents: 1 x Silver hexagonal shank chuck (0.3–6.5 mm) 1 x Black hexagonal shank chuck (0.3–3.6 mm) Note: Color appearance may vary slightly due to lighting and display settings. Measurement tolerance is ±1–3 cm.