Ningbo Kyson Cool Electronic Technology Co., Ltd. , https://www.zjkysoncool.com I plant a small batch of electrical boxes, the material is A3, the thickness is 1mm plate. The panel requires drilling, and the apertures are φ52mm, φ47mm, and φ28mm. There is no suitable mold in the factory, and it takes time and effort to use the rock (?) drill. To this end, the design of the hole drill, drilling holes in the bench drill or tapping machine, effectively solve the problem of drilling large holes in the thin plate. The structure is as shown.