The WORKPRO sliding T-bar (WP275012) has a 1/4" square drive and a sliding bar that passes through the head for comfortable work with sockets in hard-to-reach places. It is used for tightening and loosening nuts and bolts using sockets. Specifications: - Drive: 1/4" - Material: chromium-vanadium steel (Cr-V) - Finish: chrome plated, mirror polished - Sliding bar - Length: 110 mm - Heat treated