Features Material: Stainless steel and chromium-vanadium steel. Durable and stable. There are one hex socket and three square adapters in different sizes, you can use the proper one for various needs. 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. Universal SDS plus shank, fits many electric drills and chuck. Ball detent design for quick connect or disconnect, keeping stay in place while working. Features: Durable and stable. There are one hex socket and three square adapters in different sizes, you can use the proper one for various needs. Universal SDS plus shank, fits many electric drills and chuck. Ball detent design for quick connect or disconnect, keeping stay in place while working. Specifications: Material: Stainless steel and chromium-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: 1x Hex Socket Extension Adapter 3x Square Extension Adapters Package List