1. Universal piston ring fixture, fits bore sizes from 2 to 5 inch, accurately positions piston rings for end gap measurement. 2. Adjustable 3-jaw slotted design allows flexible spacing to match various engine cylinder bores. 3. Heavy steel frame with aluminum locating pins, wear-resistant and deformation-proof for long-term service. 4. Works with feeler gauges to quickly check piston ring end gap, improving engine repair efficiency. 5. Knob locking mechanism for simple setup and removal, ideal for auto shops and engine rebuilding.
