Genuine Bosch 2600108026 — Felt washer (Filzring). Compact felt ring designed for Bosch power tools to act as a lubricant-retaining seal and low-friction spacer around a shaft or bearing. Made from dense felt to absorb and hold lubricant, dampen vibration, and protect adjacent bearings and seals from dust and debris; installed as a single replacement ring in the tool’s gearbox/shaft assembly. Direct-fit part referenced on Bosch power tool parts diagrams for multiple models (examples: GWB 10, GSG 300, GW angle drills and several Winkelschleifer/1575-series tools), sold individually as the Bosch-specified felt washer.