Hover Glide M6 x 20mm Titanium Tapered Bolt.  For a complete parts list, see the product page for your specific foil.  NOTE: this screw set was previously 25mm in length and is now 20mm. 

Single screw attaching fuselage to front wing:

-FSurf/SUP Package
-Hoverglide NF2
-FWake Package
-FWind 1
-FWind 2