This item is a single piece that combines multiple roles into one compact component. It provides a separate optical axis fixed ring, locking ring, limit ring, bearing fixed spindle retaining ring, bushing, positioning ring and clamping function in a single assembly. Size: Scsaw 28x50x12. Key benefits Enables precise optical axis fixation and secure spindle retention in tight spaces. Consolidates several rings into one compact component, simplifying assembly and inventory. Improves positional accuracy and repeatability in aligned assemblies. Reduces search and fitment time by providing a single solution for multiple ring and clamping needs. Key attributes Functionality: multi function ring with fixed optical axis, locking, limiting, bearing retention, bushing positioning and clamping capabilities. Compatibility: designed for applications that match size Scsaw 28x50x12 and require a fixed spindle retaining ring, bushing positioning and related functions. Size: Scsaw 28x50x12. Material: not specified. Quantity: 1 piece. Performance: intended to offer stable alignment and retention in normal operating conditions. Applications and use cases Precision optical or measurement fixtures where the optical axis must be fixed and the spindle securely retained. Small CNC machines, jigs, or automation setups that require a single ring solution for locking, limiting travel, and bearing retention on a spindle. Instrumentation or experimental mounts needing consistent axial positioning of a bearing or bushing with clamping capability. Notes Material is not specified in the listing. Size must match the mating components to ensure proper fit and function.