| groove depth | 0.1/0.2/0.3/0.5/1.0mm;0.25/0.5/1.0/2.0/4.0mm |
| standard | ASTM.D2801-99 、 JB / T3998-99 |
【Attention】
Because the product is not easy to damage the goods, within 7 days after the customer receives the goods, if it is not the quality of the product itself, there is no warranty period. If there is a quality problem after the customer receives the goods, he or she needs to take a photo and send it to the mall customer service, and replace it free of charge after confirming the problem.