Cuts thread into concrete, brick and hollow block. Removable, adjustable and reusable. No need for plugs or pre-marking. Reversed hi-lo thread and blue climaseal finish. Use close to edges and approved for pre-cast hollow pot beams. For easy installation use the Masonry Condrive Kit (Quote 29747). Specifications: Kesternich results 30 cycles, 10% or less rust. Salt spray results 750 hours, 10% or less rust.