1/4 Inch Drop In Expansion Anchor For Hollow Solid Concrete Block Brick 100ct

These are for 1/4 Thread Rod or Bolts. We use these for mounting our concrete wall saws as well as our safety harness mounts and smaller fixings to concrete. We've used these on hollow CMU, Brick, Grout, failing concrete (went deeper into the wall), and normal concrete.

eBay