Most often, in this case, screws with a long rod of 15 mm are used.
It is important to understand that screws with all their hardness are quite fragile, by the way, here they are somewhat similar to diamonds. Manufacturers constantly improve fasteners using in their production more and more high -quality alloys. As a result, the resulting self -leading screws can be used as a real drill, these screws are able to drill a fairly thick sheet metal. As for the reliability with which they fix objects, it can be compared with the reliability that the welding seam gives.
