3.5x50 BLUE ZINC Countersunk head cup structural screw with milling segment on body and cutting point TORX 15
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.
