Model Number: ISD-8 Key Specifications/Special Features: Made from strong chrome molybdenum (Cr-Mo) steelHeat treated for best combination of strength and impactresistanceBlack phosphate finish for increased protection fromrustingFeatures a through hole and deep groove to accommodate a pinand ring for securing them to the drive to prevent accidentalremoval of the socket and ensures safe workingDepth of the hex opening designed to accommodate full standardfastener head6-point socket with chamfered opening for easily engages withdrive tools and fastenersFits impact wrenches with 1-inch square drive head