3/8" x 3-1/2" Zinc Plated Steel Concrete Stud Anchors WAS-147Type: Anchor Bolts
Drill Size: 3/8"
Type: Wedge Anchor
All mechanical bolts have a wedge arrangement at the end. Tightening the bolt results in a wedge being driven up against a sleeve. This jams the end of the bolt, and provides the strength.