QUICK CONNECT: Spherical detent design for quick connect or disconnect and stay in place while riding WIDE APPLICATION: The universal SDS plus shank is suitable for most electric screwdrivers, electric drills and chucks. It can be used for drills and bits, making these extension adapters very convenient and versatile. EASY TO CARRY: They are in small size, it allows to bring your bit extension anywhere to do any job and can fit in many tool bag. GREAT DURABILITY: Hard steel adapter for maximum durability, heavy-duty construction allows for long life DIFFERENT SIZES: there are one hex socket and three square adapters in different sizes (1pcs SDS Plus to 1/4" Hex Socket Adapter and 3pcs SDS Plus to 1/4" 3/8" 1/2" Square Drill Bit Extension Connector and you can use the right one for various needs These bit holder and extension adapters are made of high quality carbon steel and chrome-vanadium steel with heavy-duty construction to ensure maximum durability. It can be used for drill bits and bits, making these adapters very practical and versatile.Specification:Material: Stainless Steel and Chrome Vanadium SteelType: 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: 4Package includes:1 x Hex socket extension adapter 3 square extension adapters Note: The data are all manual measurement, please allow 1-3cm error, due to the difference of light and display, there will be some color difference, depending on the physical item received.