1. How shall we know the quality,if we want to order your diamond tools? Please just test it with a very small trial order,then you will witness the quality by yourself. SuMo diamond tools for 10 years has been focused on the grinding and polishing of concrete research and development and production, accumulated loads of grinding experience, as long as you specify the accurate floor density and the machine style you are to use , we can provide you with very satisfactory products. 2. What is the minimum quantity we should buy? Any amount order is available. For testing purpose,Sumo Diamond Tools Technology usually offers special discount. For regular order, it would be much better if the weight reachs 45kgs(requested by AirLine Companies, Otherwise the Airfreight below 45kgs is very high). 3. What could we do if we find your goods are not in good performance? Give us detailed report as feedback. Analyze the possible reasons. Try to find a way to solve the problem. If the problem is due to the quality of Sumo Diamond Tools Technology's product itself, We will make the compensation according to your actual loss. 4. Quality Service We guarantee ensures that every SUMO Diamond Tools Technology customer is satisfied. Any of your question or claim will be answered within 30 hours by our professional staffs.We are ensured that you can find help when you need it.