Coatstop (Foshan Coatstop Co., Ltd.) makes silicone masking plugs and caps that keep powder, paint and plating out of holes, threads and studs during finishing. The range covers tapered plugs, pull plugs, flanged plugs, flanged pull plugs, thread plugs (M0.8-M10) and masking caps for holes from 0.8mm to about 150mm, rated about 450-600 F and reusable across many oven cycles. Factory in Foshan, Guangdong, selling direct to finishing shops and OEM paint lines, with custom parts molded to your drawing.