Valley 4 Pc. 1/2" Dr. Extension Bar Set (3",5",8",10") Drive Size: 1/2" Bar Length: 3", 5", 8", 10" Made from Chrome Vanadium (Cr-V) premium tool steel for durability Manufactured and heat-treated to exceed ANSI/ASME standards (USA) Fully polished for corrosion resistance Spring-loaded ball bearing to hold onto sockets Extension bars extend the user's reach to gain access to deep, narrow areas