X1 Tools Professional Series External Retaining Rings / Snap Rings / Circplis made of Black-Phosphate Coated 1060-1090 Spring Steel making it Magnetic. A unique fastener that fits into a groove on a shaft or within a housing to retain components like bearings, gears, or pins, creating a shoulder to hold assemblies in place. Used across industries for their dynamic strength and cost-effectiveness in securing parts.