steel,zinc,stainess steel with any plated or anti rusty finish lead wood screw anchor blot at reliable quality A : use with the following base materials: ConcreteBrickBlockMortarB : features of products•Sheet metal screws are used to expand anchor .•Made from a zinc alloy,die cast material .•Rust-resistan .•Longer length anchors used in softer base material .C : how to use1.drill a hole using the ...