5-13mm 1/2" Dr. 4pt 4 Point Socket Set For Square Bolt Nut Pipe Plug

9pc set with size:5,6,7,8,9,10,11,12,13mm. Female Square Socket - these are used in many industries and for many uses - machine bolts, railways, trawlers, head lag bolts and many more. 1/2" drive, 4 points square female socket.