Features Material: metal material, which is heavy construction level material for long service life. Hard steel adapter for maximum durability, robust construction allows for a long service life Universal: There are one hex socket and three square adapters in different sizes and you can use the right one for different needs. Universal SDS plus shaft would fit most electric screwdrivers, drills and chucks. Ball lock design for quick connection or disconnection and ensuring it stays in place while driving Convenient: Small size allows you to take your bit extension anywhere to do any job and can fit in many tool bags. The universal SDS-Plus shaft fits most electric screwdrivers, drills and drill chucks. Design: Ball detent design to quickly connect or disconnect and ensure they stay in position while driving. The small size allows you to take your bit extension anywhere to get any job done and it fits in many tool bags Service: Enjoy a smooth and worry- return service within one month. If you have any questions, please feel to us. There is a hex socket and three square adapters in different sizes, so you can use the right one for different needs Specification: Description: These bit holder and extension adapters are manufactured from high quality carbon steel and chrome vanadium steel with heavy duty construction for maximum durability. It can be used for drills and bits, making these extension adapters very handy and versatile. Features: Hard steel adapter for maximum durability, sturdy construction allows for a long service life. Ball locking design for quick connection or disconnection and ensuring it stays in place while driving. The universal SDS-Plus shaft fits many electric drills and drill chucks. The small size allows you to take your bit extension anywhere to get any job done and it fits in many tool bags. There are one hex socket and three square adapters in different sizes, so you can use the right one for different needs. Specifications: Material: Stainless steel and 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 inch square head Quantity: 4 Package includes: 1 x Hex Socket Extension Adapter 3 x Square Extension Adapter Package List