Possesser perfect instrument to desect the quality of the products and strict means of administra_ tionand supervision.By its hith-grade and advanced instruments it carrieson a series of inspectio_ ns of steel ball's roundness, vibration, gauge, surface rounghness and hardness, Vickersdiamond ha_ dness and Rockwell hardness,Through these all-rounded and detailde inspections,Our steelballs have won powferfull guarantee and havebeen trusted and praised by the broad masses of customers.