GZ-900, based on bearing steel, processed with technical means of quenching, hard-drawn ,purifying, rough and purified grinding, hard chromium electroplating and mirror polishing, is widely employed in many mechanical trades as hydraulic press ure steam movement, printing and parceling, fabrics and dyeing, punching and mending machine mading tough machine, slippage device and so on .It is always the first choice of precise piston pole,leader, lead pole and lead axes.