The strength and reliability of anchor fixings depends largely from the geometry of the drilling hole. Modern anchors can only perform excellent values in exact drilling holes.

For that reason the approvals for anchors contain strong requirements for the used masonry drills.

The inspection mark of the Prüfgemeinschaft Mauerbohrer (PGM®) is the proof for the suitability of the masonry drill bits. This mark is granted only to manufacturers under the following conditions:

* state of the art manufacturing under use of a quality insurance system
* yearly inspections of the produced drill bits by independent institutes

The inspection requirements have been developed by the national approval bodies for anchors in co-operation with leading manufacturers of masonry drill bits and anchors. The Steering Committee of PGM® also conducts basic investigations to assure the suitability of masonry drill bits for anchor fixings. New types of drills bits get the inspection mark only after comparison tests proofed their suitability.

The user can be sure when he buys masonry drill bits with PGM® mark. Drill bits without inspection mark should not be used for anchor fixings regardless if they require an approval or not in order to prevent damages of persons or things. The table shows the correct marking:

Hammer drill bits (e.g. SDSplus shank)

Percussion or rotary drill bits (cylindrical shank)

A marking only with the Inspection mark, without manufacturer name or combination of digits or letters, are not legal. If you are not sure, if a drill bit is marked correctly, please contact us.