ZHANGJIAGANG PRIMWELL IMP. & EXP. CO.,LTD. as a professional masonry drill bit （construction drill） manufacturer and supplier in China, all the masonry drill bit （construction drill） have passed the international industry certification standards, and you can be completely assured of quality. If you do not find your own Intent masonry drill bit （construction drill） in our product list, you can also contact us, we can provide customized services.