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 skip-lot inspections of the produced drill bits by independent institutes
- state of the art social and environmental standards.
Please find here a list of all manufacturers which are allowed to use the PGM certification mark.