Tap Extension Overall Length 9.00 in Steel For Tap Square Size 0.1520 in 0.1910 in 0.2380 in 0.2420 in 0.2750 in 0.2860 in Fits Tap Size #0 #6 #8 #10 #12 1/4 in 5/16 in 3/8 in 7/16 in 1/2 in 1/16 in 1/8 in RS NPT For Tap Shank Dia 0.1410 in 0.1680 in 0.1940 in 0.2200 in 0.2550 in 0.3180 in 0.3810 in 0.3230 in 0.3670 in Shank Dia 0.1940 in 0.2550 in 0.3180 in 0.3230 in 0.3670 in Includes Tool Case Body Dia 1/2 in 1/4 in 3/8 in 5/16 in 7/16 in 9/16 in