Stainless steel (AISI 304/A2) toggler for installation where you can't reach to place a nut from the back side, but still need an anchor. Drill a hole 13 mm. Can take load up to 750 kg.  
 
1. Drill a 13 mm size hole. Hold metal channel flat alongside plastic straps & slide channel through the hole.
2. Hold ends of straps together between thumb & forefinger and pull toward you until channel rests behnd wall. Ratchet cap along straps with other hand until flange of cap is flush with wall.
3. Place thumb between straps at wall. Push thumb side to side, snapping off straps level with flange of cap.
4. Seal with marine sealing, for water protection. 
5. Place item over flange. Insert an M6 bolt and tighten until snug against item, then stop. Max torque 6,7 Nm.