Blades arrived quickly and were as described. Avril Zhang was very helpful and supplied all the requested information. We have had the blades tested against a domestic supplier of the same kind and we are very happy with the purchase. We plan on using them in the future for blades.

Item arrived quickly and was as described. We sent it off for testing at a local facility and they measured everything. We then drilled 10 test holes in concrete varying from 1" depth to 10" depth. After drilling we took it back and had it measured for amount of wear for those holes. The loss of surface area from those hoes being drilled was lest than 2%. I will purchase these again as the quality and customer service is very good. Thank You.