【Set Includes】3 x 1/4" hex shank extensions in 1/4", 3/8", and 1/2" drive sizes.【CR-V Steel】 Forged with heat-treated chrome vanadium steel and with black phosphate finish for corrosion-resistant and strength.【Secure/Firm】Spring-loaded ball to retains sockets and prevents them from dropping and the through-holes of the drive end of the adapter and the reducer are locked on the drive tang.【Usage】Attach the extension bars to any powered / cordless drill chuck or impact driver to turn it into a high-speed nut driver.【Chamfered Design】Chamfered ends insert smoothly into fastener head, reducing wear.
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