ITW Red Head Redi-Drive is a high performance small diameter one-piece hammer-drive anchor. The anchor holds based on a friction principle-the shank diameter is larger than the drill hole size. Anchors should be installed with carbide tipped hammer drill bits made in accordance to ANSI B212.15-1994. The Redi-Drive is available in four types: mushroom head, pipe-hanging (1/4" & 3/8"), Tie- Wire, and double head forming versions. Anchor performance in solid concrete at one inch embedment shall exceed 400 lbs. allowable tension load and 750 lbs. allowable shear load.