• Includes 4 plug adapters: 2 of 1/4 inch (H) x 3/8 inch (M) and 2 of 3/8 inch (H) x 1/2 inch (M). • Made with heat-treated chrome vanadium steel and chrome finish for greater durability and corrosion resistance. • Chamfered ends and spring-loaded ball detent for secure socket retention, preventing them from falling out. • Retention notches on the drive end grips, ideal for industrial, mechanical, or construction work. • Radial corners within the drive that prevent stress concentrations and potential cracks.