5/16"-18 x 2-3/4" Zinc Concrete Wedge Stud Anchor Bolts WAS-300 (50 pcs.)Type: Anchor Bolts
Drill Size: 5/16"
Thread Size: 18 (Coarse)
Type: Wedge Anchor
Box of 50.
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.