Wire Mesh,Metal Mesh,Steel Mesh,Stainless Steel Mesh HENGSHUI YUZHENG IMPORT AND EXPORT CO., LTD. , https://www.yuzhengnails.com Manual sharpening of drill bits is very common in the machinery manufacturing industry. It is not easy to drill a bit that meets the requirements of the drawings for each sharpened bit. The most prone problem is that the hole diameter is too large. When drilling the through hole, the diameter of the outlet end is small, the drill tip drifts, the drilled hole is not perpendicular to the drilling machine table, the hole wall is not straight, and the position is difficult to ensure.