... lock nuts, hex coupling nuts, flange nuts, square nuts, etc.), flat washers, spring washers, mudguard washers and so on. Our main ... market, and there are almost 2000 varieties also.The main metal surface treatment is white zinc plated, yellow zinc plated, black ... trader and would appreciate the advice wholeheartedly. Frame Anchor 1. Metal Frame Anchor 2.Nylon Frame Anchor3. Material is stainless steel ...