UNC
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21) 1.1/4 x 7 UNC Go / NoGo Screw Plug Thread GaugeSpecial Price £135.55 Regular Price £193.641.1/4 x 7 UNC Go / NoGo Screw Plug Thread Gauge
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22) 1.3/8 x 6 UNC Go / NoGo Screw Plug Thread GaugeSpecial Price £163.75 Regular Price £233.931.3/8 x 6 UNC Go / NoGo Screw Plug Thread Gauge
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23) 1.1/2 x 6 UNC Go / NoGo Screw Plug Thread GaugeSpecial Price £175.29 Regular Price £250.421.1/2 x 6 UNC Go / NoGo Screw Plug Thread Gauge