1.If it is found that the cutting speed of the SUPER-HARDER wire saw is slower than that of similar products, and the cutting life is less than that of similar products, it can be returned.
2.If it is found that the drilling speed of the SUPER-HARDER drill bit is slower than that of similar products, and the number of drilling hole is less than that of similar products, it can be returned.
3.If it is found that the cutting speed of the SUPER-HARDER saw blade is slower than that of similar products, and the meter of cutting is less than that of similar products, it can be returned.
4.If it is found that any beading, cutting from one-side, breaking rope of the SUPER-HARDER diamond wire, it can be returned.
5.If it is found that segment of core drill bit lost or swing, it can be returned.
6.If it is found that segment of saw blade lost or out of shape, it can be returned.