Specification: M6*70 (bolt diameter 6mm, screw length 70mm) Quantity: 5pcs Made by: It is made of 304 stainless steel, durable and can be used anywhere. • the exterior. It has better resistance to rust (Can be used in moisture or water and will not rust). Hole size: Choose a drill bit with impact mechanism of the same diameter as the expansion pipe screw expansion pipe and install it on the electric drill to drill the wall. The depth of the hole is the same as the length of the bolt. The expansion pipe should penetrate the wall and be as long as the threaded part is long enough, the sleeve part is deeper and more solid. Note that the expansion screws must be installed on a relatively rigid substrate. The resistance to expansion must be installed on a relatively rigid substrate. The resistance to tension installed in the concrete is five times greater than that of the concrete. that of the stones M6/M8/M10/M12 expansion bolts in concrete, its tensile load is 120kg/170kg/320kg/510kg