ARP piston ring squaring tools are dual sized to make fitting piston rings as accurate as possible. These tools are CNC-machined from 6061 T-6 billet aluminum tube material and black anodized for a brilliant finish. The bore sizes are prominently engraved for easy identification and range in size from 3.150 in. to 4.800 in. SAE and 80mm to 122mm metric.

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