Performance Tool W1398 10mm Serrated Wrench (12 Point.), 1 Pack Go to amazon.com Related posts Where to find serrated wrench? FeatureSize: 10mm12 point triple square.1/2" hex drive shaft.Heat treated alloy steel. Description10mm Serrated Wrench (12 pt.) Size: 10mm 12 point triple square. 1/2" hex drive shaft. Heat treated alloy steel.