ARP fasteners Tapered Piston Ring Compressor AR900-3900 Product:fits 4.390" Bore These adapters are the cleanest

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ARP fasteners Tapered Piston Ring Compressor AR900-3900 Product:fits 4.390" Bore These adapters are the cleanestTapered Piston Ring CompressorFits 4. 390" Bore Brand: ARP Part Number: AR900 3900 Description: ARP's ring compressors are CNC machined from 6061 T6 billet tube material and feature a true radius and they are relieved for wire O rings. Type 3 anodizing is used for long life, and the bore size is prominently engraved for easy identification. Standard stocking sizes from 3. 552" to 4. 750" (SAE) and 75mm to 100mm (metric).