Female Square Socket - these are used in many industries and for many uses - machine bolts, wheel nut, railways, trawlers, head lag bolts and many more,
Made from Cr-Mo steel, heat treated, black finish.
1/2" drive, 4 points square female socket.
Size option: 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 24mm, 25mm, 27mm.