Description: 1. Hard steel adapter for maximum durability, heavy duty construction enables a long life span 2. Ball detent design for quick connect or disconnect and ensures it stays in place while driving 3. Universal SDS Plus shank fits most screwdrivers, drills, and power chucks. 4. Small size allows you to take your drill bit extension anywhere to get any job done and fits in many tool bags. 5. There are one hex socket and three square adapters in different sizes and you can use the proper one for different needs. Specification: Material: Stainless steel & Chrome vanadium steel Type: SDS Plus - 80mm x 1/4" Hex Socket, SDS Plus - 65mm x 1/4" Square Head, SDS Plus - 65mm x 3/8" Square Head, SDS Plus - 75mm x 1/2" Square Head Quantity: 4 Package Includes: 1 x Hex Socket Extension Adapter, 3 x Square Extension Adapters