It doesn't have and brings about that there is pit on revetment brick on account of nut protrusion.In the existing embodiment, the amount of counterbore and fixation hole is just not restricted Other features and advantages of the utility model will illustrate in the following description, also, partly from https://feedingequipmentforprecas17371.creacionblog.com/33315543/press-molding-machine-things-to-know-before-you-buy