ARP Piston Ring Compressor, 4.040" Bore, Tapered, Billet Aluminum, Black

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).