The Solid-Pro double-threaded wood screw is used for installation in heavier structures such as glulam beam systems and wooden structures. The screw is coated with ProProtect, a C4+ pro-rated and durable coating for outdoor use. The milling tip/cutter eliminates the need for pre-drilling and reduces the risk of cracking. CE marked for constructions. CE / ETA - approved These screws are intended for constructions in joists, glulam, construction joists, etc. Perfect for avoiding fittings and hole plates. You can advantageously use long bits so that you can get far into the construction to achieve countersinking and traction. The screw is equipped with a fiber cut in the tip that reduces the screwing torque and minimizes cracking. This also means that you do not need to pre-drill. Manufactured from hardened steel and C4+ pro rated surface treatment. Meets the CE requirement according to EN14592. The unthreaded part in the middle in combination with 2 different thread pitches gives you maximum traction. We believe that this is the absolute best construction screw on the market. Also check the prices . Thread lengths Total length Thread under head unthreaded part Thread incl tip 6,5 x 90 90 mm 37 mm 5 mm 42 mm 6,5 x 130 130 mm 37 mm 45 mm 42 mm 6,5 x 160 160 mm 62 mm 25 mm 67 mm 6,5 x 190 190 mm 87 mm 25 mm 84 mm 8 x 175 175 mm 104 mm 60 mm 110 mm 8 x 220 220 mm 90 mm 30 mm 97 mm 8 x 300 300 mm 130 mm 30 mm 134 mm 8 x 330 330 mm 130 mm 60 mm 134 mm