Professional tool for commercial or occasional use Metric single socket 1/2" drive socket so will fit any 1/2" drive ratchet / extension / power bars etc... 13mm super lock socket 6-sided single hex socket Super lock socket so the more pressure you put onto the socket, the more it will grip the nut or bolt. Especially useful for using on worn or rusty nuts and bolts Knurled ring around the middle of the socket for maximum grip especially in greasy / oily conditions Manufactured from chrome vanadium steel for strength and durability SPECIFICATIONS - TYPE - Lock socket - DRIVE SIZE - 1/2" Drive - SIZE - 13mm