Hilti KWIK Bolt TZ Expansion Anchor - Carbon Steel - KB-TZ 3/4 x 8 - 387521- Box of 10 Model:. Especially Suited for Seismic and Cracked Concrete Applications. Seismic Qualifications Tested in Accordance with ACI 355.2 and ICC-ES AC193. Small Minimum Edge Distance and Spacing for Maximum Design Flexibility. Nuts and Washers are Pre-Assembled. Rounded End for Easy Installation.