Wej-It Ankr-TITE AT Wedge Anchor, Carbon Steel, Zinc Plated Finish, Meets QQZ-325Z Type II Class 3 and GSA FFS-325 Group II Type 4 Class 1 Specifications, 1/4" Diameter, 3-1/4" Length, 2-1/4" Threaded Length (Pack Of 20)