Thunder bolts are used to fix into concrete, brick, wood, marble and stone. Simply drill the correct sized hole for the chosen bolt and tighten with an impact driver, socket or spanner. The bolt will tap its own thread into the hole, no plug or resin needed! Thunderbolts can also be removed if required.
For M8, drill an 8mm hole & tighen with a 15mm socket. For M10, drill a 10mm hole & tighten with a 17mm socket. For M12, drill a 12mm hole & tighten with a 19mm socket.