This 58mm tune-up kit upgrades your Breville espresso machine with premium components designed to enhance extraction quality and consistency. It features an IMS shower screen with 35 µm filtering capacity and a brass shower holder that replaces the original plastic component. Compatible with: Breville BES900XL, BES920XL, BES980XL, BES990, and equivalent Sage models. The IMS screen's membrane evenly distributes water flow and prevents channeling for more consistent extractions, while resisting oil buildup better than standard steel screens. The brass holder provides superior heat retention compared to plastic originals and sits slightly lower in the group head, allowing increased coffee capacity in the filter basket. The original screw remains compatible with this upgrade.