The 1/4x2 1/4 DeWALT Engineered by Powers SCREW-BOLT+™ High Performance Screw Anchor Zinc-Plated (100) provides superior holding power for heavy-duty applications. This zinc-plated anchor offers exceptional performance for use in concrete, block, brick or masonry base materials and is suitable for both indoor and outdoor use. It is rated for a pull-out of 1850 lbs in 4000 psi concrete.