These are replacement bolts for the Takuma Hydrofoils. Here is a complete list of the bolts originally included with your Takuma foil. Simply choose the bolts you want or a complete set from the options.
This is what comes in the complete Takuma replacement set:
3 qty for base plate to mast: M6x35 3 qty for mast to fuselage M6x45 2 qty for fuselage to front wing M6x25 2 qty for fuselage to rear wing and shim M6x25 4 qty for base plate to t-nut and track M6x25 4 qty M6 stainless steel t-nuts