The Red Head RT134 Drop-in Anchor Setting Tool is designed to set drop-in anchors. This anchor setting tool can be used with Red Head RM, SRM, CL and RL 3/4 in. drop-in anchors. It is made of steel for long-lasting durability. The 3/4″ thread size works with Red Head RM, SRM, CL and RL 3/4 in drop-in anchors. The internal thread diameter measures 3/4″. With the Red Head RT134 Drop-in Anchor Setting Tool, you will have an easy time setting your drop-in anchors thanks to its simplicity and ease of use.