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This is more for delicate surface locking .. using speed nuts. 5 types .. 4 with rubber sealing rings.
4 types of them ..different post hole sizes WITH rubber backing so rather then metal to metal its rubber to the surface.
1 pack of 8 speed nuts without rubber for slightly larger needs.
Total min 40. Rubber backed are dearer then just pressed speed nuts are but not used in every situation.
Usefull for really decades of restoration needs.