Qty seven 5X0.8X8mm T-25 Torx stainless steel replacement screws. These are the screws that go through the silencer Can to attach the TSI-1-2.0, TSI-1-2.1, TSI-1-3.0, TSI-1-3.1 & TSI-1-4.0 spark arrestors, they are also used on the inlet side of the can to replace the rivets on the Beta silencer can.