Deep Socket for Unistrut type channel fixing bolts. Size: 13mm single hex (6 pt) x 1/2"D; length: 72mm. Deep socket to accommodate stud length & channel depth. Manufactured from chrome molybdenum with black phosphate finish. Restricted access socket. Other sizes also available, please see Laser Part Nos. 7699 (17mm) & 8019 (19mm).