The nut tightening type is removable. Just insert the core rod into the construction, so you can see the finish of the installation at a glance. The body and screw parts are the same diameter, so drilling into concrete is required. Can be installed directly from the top of the mount. Screw Nominal: M12; Total Length: 4.7 inches (120 mm); Thread Length: 2.0 inches (50 mm); Hole Diameter: 0.5 inches (12.7 mm); Tensile Maximum Load: 17.1 kN; Embedded Depth: 2.0 inches (50 mm); Mounting Thickness: 0.04 inches (1 mm); Weight: 4.5 oz (1 oz (1 oz (1 oz (1.5 oz (1.5 g); Comes in box; Material: Stainless steel (SUS30 g).