we guarantee high quality and each workpiece is tested to 2.5 times its working load limit;
we carry out spot checks and 20,000 fatigue tests, and we subject each batch to rigorous spot and breakage testing;
that we will carry out 100 per cent magnetic particle testing;
we carry out 100 per cent pin testing to ensure that they have the same hardness;
As for the surface treatment, we use plastic spraying.
The minimum ultimate load is 4 times the working ultimate load.