Shanghai Rui Qi diamond drill bit, customized selection of the finest materials, and drilled a sharp, suitable for all kinds of concrete, brick, refractory materials such as punch! The scope of 1: "very odd" diamond thin wall bit of engineering application of concrete and reinforced concrete, architectural brick drilling such materials. 2: "very odd" diamond thin wall bit of engineering apply to handheld and desktop rigs. 3:96mm bore diameter or diameter greater than or equal to 16mm steel bar in concrete, and the amount is more, suggested the use of bench-top drill combined with the use of this product, the drill better and more efficient.