countersunk chipboard screws

Resin anchors, also known as chemical anchors, are a type of fastener that utilizes a two-part epoxy resin system to securely attach components to concrete surfaces. This system consists of a resin cartridge filled with a mixture of resin and hardener, and a separate bolt or anchor that is inserted into the cartridge. When the bolt is rotated, it mixes the resin and hardener, causing a chemical reaction that rapidly cures the resin and creates a strong bond between the anchor and the concrete.

...

2. Drill the hole Use a drill bit that is slightly smaller than the diameter of the anchor rod. Drill the hole to the recommended depth, which can be found in the anchor's specifications Drill the hole to the recommended depth, which can be found in the anchor's specifications Drill the hole to the recommended depth, which can be found in the anchor's specifications Drill the hole to the recommended depth, which can be found in the anchor's specificationsthreaded rod chemical anchor.

...