Simpson Strong-Tie Drop-In Internally Threaded Expansion Shell Anchor Lip at the top of the anchor body keeps the top of the anchor flush with the concrete Available in coil-threaded version for 1/2 and 3/4" coil-threaded rod Eliminates the need for precisely drilled hole depths and enables an easier flush installation; consistent embedment and uniform rod lengths Minimum thread engagement should be equal to the nominal diameter of thee threaded insert Dedicated setting tool included with DIA37S" Simpson Strong-Tie Drop-In Anchors 3/4" Coil Thread Rod (PACK 20) DIA75C