Drop-In Anchors are internally threaded expansion anchors, allowing for flush installation. The newly designed Simpson Strong-Tie DIAB series improved design allows for installation with fewer hammer strikes, increasing your efficiency. See our full offering of the DIAB series including short and lipped styles. You can also consider a Hollow Drop-In anchor for projects requiring installation into a hollow base or core material for attaching threaded rod. Browse our full offering of rod and studs, or submit a quote to the Fasteners Etc, Inc. Machine Shop to cut threaded rod to your exact specifications. Be sure to grab a setting tool and SDS bit to complete the project!