Description: The built-in strong spring makes it easy to press and rebound quickly. And the universal feature makes it can be used with hexagonal shank bits, cross bits, drill bits, and socket. Two different specifications allow you to choose the most suitable one according to your needs. The small size makes it very convenient to carry and store. Made of chrome vanadium steel material, it is very durable to use. There are two specifications for you to choose from: 50, 60. It is suitable for quick transfer of electric drills, screwdrivers, wind screws, etc. Item Name: Quick Coupling Material: Chrome Vanadium Steel Product Shank Diameter: 1/4 Inch Product Shank Type: Hexagonal Shank Features: Pop-up, Firmly Clamped, High Stability Size Details: 50: 5cm x 2.3cm x 2.3cm/1.97" x 0.91" x 0.91" (Approx.) 60: 6cm x 2.4cm x 2.4cm/2.36" x 0.94" x 0.94" (Approx.) Shank Diameter: 0.635cm/0.25" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Quick Coupling