This is a set of two replacement XRAY Aluminum Shock Cap Nuts, with vent holes, and are intended for use with the Aluminum 4-Step Shocks for the XRAY T2 009. These upper aluminum caps feature a small vent hole that makes shock assembly very predictable and easy, since excess shock oil will escape through this vent hole ensuring that only the proper amount of the oil is inside the shock assembly. Machined interior ridges ensure proper placement and sealing of the super-soft silicone membrane.