●This product is ordered by the lot. Purchase Unit: 30 pieces; Torque management construction and large three-sided wedges ensure solid strength. The same screw diameter and bottom hole diameter so you can install it over the top of the fixture; Electrical construction, plumbing work, heating and cooling duct work, elevator construction, railway installation; Screw Nom: M10; Total length: 2.8 inches (70 mm); Embedded depth: 2.0 inches (52 mm); Bottom hole diameter: 0 mm). (kN):1 9.9; Box; Stainless steel