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1. The use of fetal tooling, and the number of tooling use is strictly limited;
2. The wheels are forged and have treads
Quenching treatment;
Advantage：
1. Ensure the production accuracy, uniformity and interchangeability of products;
2. Wear-resistant, long service life;
1. The use of fetal tooling, and the number of tooling use is strictly limited;
2. The wheels are forged and have treads
Quenching treatment;
Advantage：
1. Ensure the production accuracy, uniformity and interchangeability of products;
2. Wear-resistant, long service life;
