1.All parts are heat treatment(quenching and tempering) and controlled in a reasonable tolerance range.

2.Tensile strength:15-20% higher than the standard

3.Certificate of Quality: ISO 9001:2000,SGS

4.Centreless grinding.

5.Good lubrication with excellent grease.

6.Color:self,dark yellow,dark blue,black,nickel plated,zinc plated,copper plated.

7.All attachments are the standard sizes.

8.Type: One side outer plates with attachments,one side inner plates with attachments,one side outer and inner plates with attachments,two sides outer plates with attachments,two sides inner plates with attachments,two sides outer and inner plates with attachments.