Instructions for use: Rotary hammer drill bitsGeneral work instructionsRotary hammer drill bits are primarily used in concrete, masonry, natural stone, etc. They are not suitable for materials such as bitumen, plastic, glue, adhesives and metal. The rotary hammer drill must be guided in a straight l

How to Sharpen Masonry Drill Bits A lot of the holes I drill tend to be into brick, masonry, or concrete, and I find that I am constantly having to change drill bits as they become dull and lose their edge.For me this is a problem as masonry bits are not cheap so I looked at the best ways to re-shar

Series of high quality drill bit for the different porcelain drilling purposes to meed different porcelain&ceramic hardness request from level 1 to the one above level 6. The best product project is made by HTT under the technology development and the constant innovations.