good quality aganist competitive price. Description: screws1) Specification: DIN,ANSI, BS, such ... tapping screwsSelf drilling screwsMachine screwsWood screwsBolt and nuts ,washer ,thread bar Material: carbon steel& Stainless steelSize:all sizeSurface : Yellow zinc black ... produce the screws as customer's drawings and samples with high quality. high quality,CSK head self tapping screws