Acc. to DIN 7422 
 Square drive as per DIN 3120 - C 12.5, ISO 1174, with ball retaining groove 
 Hand-operated, knurled grip 
 Chrome-plated 
 With pressed-in pin in GEDORE vanadium special steel, manganese-phosphated 
 * t = stepped hexagon bit 13 mm 
 * not standardised