... and temperature keeping materials in the form of mesh container, stone cage, isolation wall, boiler cover or poultry fence in construction ... ,21,20,5/8"16mm27,26,25,24,23,223/4"20mm25,24,23,22,21,20,191"25mm25,24,23 ... ,22,21,20,19,181-1/4"32mm22,21,20,19,181-1/2"40mm22,21,20 ... Gauge(BWG)Inchmm(BWG)1"25mm22,21,20,181-1/4"32mm22,21,20,181-1/2"40mm20,19,182"50mm20 ...