Tréskr. Ryðfr. Undz. – 4,0×50 T20 
Expandet Extra V2 allround screw with countersunk head, milling ribs and saw thread. Produced in A4 (316) suitable for outdoor use according to Euro Code 5. It is suitable in ACQ with a high content of tannic acid (larch and oak), and in aggressive environments. CE-marked in loadbearing constructions.