Yes The hollow grouting anchor has obtained 28 national MA coal safety certification and other mining product inspection certificates, registered the China Coal trademark issued by the State Trademark Office, and obtained the right to use the China Coal Pinyin trademark. Hollow grouting anchor adopts hollow design, and the holes in the rod body are used as high-pressure feng shui channels and grouting channels. Compared with solid rod, hollow rod design can obtain better rigidity and shear strength. Coal safety, that is, coal mine safety, coal safety certification generally refers to the compulsory certification of underground equipment in coal mines.