1.probe holder of easy connection 2.riveting thimble of long useful life 3.riveting thimble of great electro conductivity SF-R100 probe holderRecommended minimum center:2.54mm(.1000")Mouting hole size:acryl:1.70mm(.0670")bakelite sheets,glass wool board:1.75mm(.0689")Materials and finishes:Barrel:Brass,Gold platedConnectioins:Crimp:R100-VCR2.5,R100-CRSolder cup:R100-VSC2.5,R100-SCWire wrap:R100- ...