1/2"-13 x 8-1/2" Coarse Thread TorqueMaster Blue Wedge Anchor Bolts (15 pcs.)Type: Anchor Bolts
Drill Size: 1/2"
Thread Size: 13 (Coarse)
Type: Wedge Anchor
Box of 15.
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.