TEKTON 1601 3-pc. 3/8 in. Drive Extension Bar Set - Cr-V Selling Unit: Set Features: Extend your reach to get at fasteners in tight spots using the TEKTON 3-Piece 3/8 in. Drive Extension Bar Set. Made from drop forged, heat-treated chrome vanadium steel, and triple chrome plated for ultimate durability, these tools are made to last. Notches on extensions securely lock onto ratchet drive, and a spring-loaded ball bearing locks onto sockets. The non-slip knurled band allows fingers to grip and turn shaft, quickly starting or removing loosened fasteners.