The original SlotBox design offered some advantages over a standard US box:
/ WEIGHT. THE SLOTBOX WAS LIGHTER, SO HELPED PREVENT BOARDS WITH MULTIPLE FIN BOXES BEING TOO TAIL-HEAVY.
/ SIMPLICITY. INSTALLING A FIN IN A SLOTBOX WAS QUICKER AND EASIER WITHOUT HAVING TO FIRST INSTALL A PLATE AND THEN LINE UP THE HOLE IN THE FIN TO ADD THE SCREW.
But there were some disadvantages. Even minor impact could cause damage to the box, or easily knock the fin out.
With the new SlotBox+ design the advantages have been maintained and the disadvantages addressed. Even lighter than the original SlotBox means multiple fin setups can be used on the one board without a weight penalty. Thruster or Quad options can be chosen depending on conditions or preference.
By adding a locking pin at the front of the box fin retention is now a lot more reliable, which means minor reef contact isn't likely to end your session. Supplied fins have a groove in the base to lock onto the pin for added reliability, but any existing SlotBox fin is still compatible without any modification.
Bigger HEX4 grub screws handle impact and also add to overall reliability. And uses the same tool as your batten tensioners.