Hole folder: are stationery accessories, the industry generally called Binder, ring folders. Save files safe and secure, smooth rollover files will not scratch files, without opening match hook mouth, elegant appearance, structural stability, easy to scratch or depression, whole clip strength increase, not deformed. Use: the clip board two fixed file, you can use Material: steel (Levin material) Surface treatment: nickel plated ring shape Optional: Q-type, R-shaped, D-shaped, D-shaped oblique factory production hole folder reliable, durable, welcome customers QQ advice or telephone counseling.