For Use in Restricted Areas. Ideal for use in areas where a T handle won't fit. Set of 8 sockets fits all number and fractional M.C.T.I. standard taps thru 1/2\". Also fits 1/8\" NPT taps and metric taps thru 12mm manufactured to M.C.T.I. standards. Sockets contained on a vinyl holder. Part# Fits In Fits Metric Shank Sq Size Drive 70520 #1 1.2.3. 1.6, 1.8, 2 0.141 0.110 1/4\" 4, 6, 8 2.2, 2.5, 3, 3.15, 3.5 --------------------------------------------------------------------------------------------------- 70540 #2 8 4mm 0.168 0.131 1/4\" --------------------------------------------------------------------------------------------------- 70560 #3 10 4.5, 5mm 0.194 0.152 1/4\" --------------------------------------------------------------------------------------------------- 70580 #4 1/4\" 6, 6.3mm 0.255 0.191 1/4\" --------------------------------------------------------------------------------------------------- 70600 #5 5/16, 7, 8mm 0.323 0.242 3/8\" --------------------------------------------------------------------------------------------------- 70620 #6 3/8\" 10mm 0.381 0.286 3/8\" --------------------------------------------------------------------------------------------------- 70640 #7 1/2\" 12, 12.5 0.367 0.275 3/8\" mm --------------------------------------------------------------------------------------------------- 70660 #8 1/8\" 0.437 0.328 3/8\" NPT --------------------------------------------------------------------------------------------------- *70660-Overall length 1 11/16\", O.D.- 3/4\"