Various versions of track nuts (some with screws) for foil boards. 

LOCKING T-NUTS (4 in a pack)  M6 or M8 Threads . An Allen screw locks your track nuts to stay in the place that works best for you. Locking T-Nuts are a total game changer. No longer do you need to mess about fishing around trying to place the T-Nuts in the correct position in your foil box. Simply put them in position once, tighten up the M4 grub screw, and away you go. They will always be in the same place for every session and it will stop you from loosing/leaving them in weird places.  Please note that the M4 locking screw does not need to be overtightened. It simply holds the track nut in position, so just tighten enough to lock it in place and no more. If you over tighten it could damage your board, and we do not want that! See the Video for a Balz intro.. II think he likes them.

Fanatic / Duotone 8mm Screw Set Foil Mounting System (incl. nuts) (4pcs) 8mm  Item No. 13210-8175.  Fits most boards and foil heads that require *30mm x 8mm Countersunk bolts and brass T nuts. *30mm includes the head, threaded length 25mm

Fanatic / Duotone 6mm or 8mm Brass Nut Set for Sky Air (Price is per Nut) Item No. 13210-8063. 

6mm or 8mm Blind Nuts to stop the bolt going into the board! Also Used on RRD etc. 

F-One 6mm Track Nut set (4 pieces)  171790-057 T Nuts for Hydrofoil boards with track system  F-One T-Nuts (A4)  are compatible with all US twin tracks.

F-One 8mm Track Nut set 77217-8020 (as above but in 8mm thread) See KT Nuts as very close if out of F-One.

STX Track nut set for Inflatable Foil Boards 6mm. ( 4pcs) 406.15090.000 US Track plates with 25mm x 6mm stud. Supplied with Nyloc nuts and 15mm safety washers.

Windriven 6mm Brass Track nuts. Brass machined Track nut with M6 thread for use with all foils.

Duotone Track Nut set . 4 x  20mm x M8 Countersunk bolts and 4 x brass T nuts. (same as Fanatic)

Goya 8mm Track Nuts Stainless. Supplied singularly.

KT 8mm Track Nuts Stainless. Supplied singularly.