Aluminum windows and doors equipment Zhangjiakou how much money a four-position pneumatic press. Stamping smooth, high production efficiency. Aluminum casement window hardware for mounting hole punching slots (only 20mm European standard C trough); powered by a pneumatic foot valve control, stable; four job positions expected to be completed by flat open fan mounting slot handle, cut angle and actuator tip punching (Φ 10, Φ 6) Processing