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[PRECISE 51MM FIT] Built for 51mm cylinder diameter systems this ring set matches 54mm outer diameter and 48mm inner diameter for accurate fit on compatible air compressor and air pump units. [STEEL DURABILITY] Made of high grade steel these piston rings offer strong wear resistance and oxidation resistance helping reduce rust while supporting dependable service in pneumatic motor applications. [STRONG SEALING PERFORMANCE] Designed to maintain tight contact between piston and cylinder wall these rings help support airtight operation under high speed and high pressure working conditions. [DIRECT REPLACEMENT SET] Ideal for replacing worn or damaged piston rings when axial clearance exceeds 0.13mm this 3 piece set installs as a direct replacement with no extra modification needed. [WIDE COMPATIBILITY] Suitable for 1.1KW and 1.5KW motors plus 0.12 and 0.17 air compressor air pump accessories a practical choice for repair maintenance and workshop parts replacement.