----Our factory introduces the international advanced equipment, the speciality produces GB 7246 - 87 of washer of spring of wave form , shape spring washer of saddle: GB 7245 - 87, spring washer of shape of duplicating each other: One 7244th GB, make up and spend playing the cushion: 9072.26 GB, products finish marking American to finish making Great Britain finish making Germany finish making and wait for standard produce specification dia. 2 according to country --dia. 30, material : 65 Ms, 70 steel, stainless steel, The phosphorus copper of the purlin. 4. 8,6 mechanical performance grade. 8,8.8,10.9,12.9 from machineries, electric powers, traffic, building, automobiles,etc. trades form a complete set and serve, Win trust and favorable comment from the masses of customers deeply.