Input Drive: 3/4" FemaleOutput Drive: 1" MaleMaterial: Black Oxide Heat-Treated Alloy SteelImpact RatedDesigned To Use With Power Tools, Such As An Impact Driver Or Impact WrenchConverts 3/4" Drive Ratchet Or Breaker Bar To A 1" DriveOnce Attached, The Unit Will Now Accept Any 1" Drive SocketDesigned To Use With Impact Sockets, But Can Be Used With Traditional (Non-Impact) Sockets With A 1" DriveLaser Etched Markings For Easy IdentificationDual-Hole Design And Ring Groove Allow For Easy Adapter Attachment And Removal