Can be used with concrete without a plug, and it can be easily installed with an ordinary screwdriver. Can be installed with various types of pipes saddle fasteners, switch boxes, curtain rails, storage shelves, air conditioning equipment, lighting fixtures, interior substrate materials, etc. Nominal diameter: d: 0.2 inches (6 mm); Bottom hole diameter: 0.2 inches (5.5 mm); Embedded depth: 1.6 inches (4 mm); Compatible driver: 0 mm); Head Shape: Countersunk Compatible Materials: Concrete, blocks; Mini pack; Steel; Surface treatment: Silver plating; Surface treatment: Silver plating