8pcs folding torx key set, torx key set,key set tool, torx key set tool,folding torx key henan horn tools co.,ltd. , https://www.hornhandtools.com In our product LN-35 sulphur hexafluoride circuit breaker, the insulation tube is bonded with the upper terminal block and bonded with epoxy resin to ensure the sealing requirements. The dimensions of the parts are shown in Figure 1. The material is a phenolic glass cloth board. The material is hard and brittle, and the deep grooves in the part are deep and narrow, which is difficult to machine with a general turning tool. To this end, we design