The system works if you have enough grout, but when we drilled 1" holes in the asphalt the hole got enlarged once we hit the crushed rock base and the kit didn't provide us with enough grout. We would recommend the kit supplying twice the amount of grout just to be safe.
Comment by Manufacturer: The kit is designed, and specified, for 7/8" holes. Indeed, the larger the hole, the more volume needs to be filled with grout.
Reviewed by: Jorden Weiner from Seattle, WA on 7/5/2019