Halogen-free lockable clamps are a fastening system for rigid wiring pipes of the RLHF and RSHF type, but they can also be used as a fastening system for halogen-free corrugated wiring pipes. They are mainly used in wall installations. Lockable handles are made of modified polypropylene, which, being a combustible material, has such features as high tensile strength, high impact strength and temperature resistance.