t1 slotSlot opening width : 6mm Finger width : 9mm; Colour : Grey RAL 7030; T1 = 18mm, 30mm, 40mm and 60mm hehts; T1-F = 80mm, 100mm and 125mm hehts; T1-F have an extraSwitch FormD T1 From 2-Slot Mode To 3-Slot Mode. Since the air cooled GPU we will be using is massive, we need to switch to 3-slot mode. First swap out the 2-slot GPU bracket for the 3-slot