A magnetic Cylinder keeps the fastener engaged when it would otherwise fall out. Deep sockets feature a spring, allowing the bolt or pin to push into the sockets body while it is being screwed it. Female drive with Groove and hole so you can use a pin and O-Ring when working with power tools. Super drive design. Deep sockets feature a spring, allowing the bolt or pin to push into the socket's body while it is being screwed it. Female drive with Groove and hole so you can use a pin and O-Ring when working with power tools. The product comes with a super drive design.