Product Description 1. Application: 5Pcs Tap Socket Set Fit 5/8″, 11/16″, 3/4″, 7/8″ and 1″ (16mm, 18mm, 22mm and 25mm) socket taps. Especially in tight spots and restricted areas that the T-handle will not fit in. For larger, fractional M.C.T.I. standard taps. 2. Essential for Your Toolbox: Our Tap Sockets are fantastic tools to simplify tapping new threads to fix stripped and damaged bolt threads. Ideal for use in tight spots and restricted areas where the T-handle will not fit in. .