... are welcome. 3.distributorship offered 4.OEM servic copper tube compression fittings 1>Quick details a). Machining screws not b). High ... Regulation h). Good quality, Competitive price, Excellent2>Product introduce screws nut products includes bolts,screws, nuts, shafts , shaft liners, flange, gear ... . A>Common Ground a) Bolt sizes:M4-M22*length b) Nut sizes:M4-M22 c) Standard:GB,ISO,DIN,BS,JIS ...