4.0x40 YELLOW ZINC constructional screw, flat head with collar (wafer head) TORX 25
Firma Killich s.r.o. offers special screws Profix RF for wooden structures.These special wood screws are two-hole with reaming thread. The head is countersunk with milling grooves and TORX grooves. They have a self-tapping tip. The assortment of screws includes steel screws in yellow zinc. The screws have a TORX slot - a TORX screwdriver. They are a cheaper substitute, with the same quality, for RAPID construction screws.
