a) FREM wood screw. This screw has a milled tip for easier entry into the wood. It also has a cutting thread at the start of the worm thread to remove shavings. Another feature are the grooves under the head that make it easier to ream the wood and ensure better fastening.

b) Connecting bolt with cutting thread Hi-Lo No. 5. This bolt is characterised by the grooves under its head to make it easier to ream the wood and ensure better fastening. The thread is Hi-Lo, with two different diameters in the worm thread to facilitate its introduction. This bolt also has a cutting thread in the first worm threads to facilitate assembly.