18mm x 13/16" long Heli-Coil aviation grade spark plug insert. 1 lbs (0.5Kg) shipping weight.
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Installs rings from 3" (76.2mm) to 5" (127mm). Superior to regular ring compressors in the following ways: Low Friction! Wrinkle band cuts friction in half. Ring slides in easily; Wrinkle Band can't slip down into cylinder
Cleans carbon from piston ring grooves. Easily adjustable. Blades included for five most popular piston groove sizes: 5/64", 3/32", 1/8", 5/32", 3/16". Insert blade into piston groove with slight pressure.