●This product is ordered by the lot. Purchase Unit: 50 pieces; Color outer diameter is thin to the diameter of the hole so the hole diameter is smaller, making it easier to install upward; Uses an internal cone to eliminate the loss of cones or loss after installation; For concrete construction; For electrical work, plumbing, heating and cooling duct construction; Screw Nominal: W1/2; Total length: 2 mm; Outer diameter: 0 mm; Drill diameter: 0.6 inches (16 mm) .5; Maximum Tensile Load: 34.5 kN; Box; Steel