The 11-pc Tap Socket Set, No. 70700, from Lisle, fits all number and fractional taps through 1/2" and 1/8" NPT taps manufactured to M.C.T.I. standards, as well as metric taps through 12mm manufactured to M.C.T.I. standards. The #2, #3, and #6 sockets can be used on non-M.C.T.I. taps. The sockets are ideal for areas where T-handles won't fit.