Set piston ring end gaps accurately, consistently and with repeatable results by using this Checkered Flag Performance universal ring squaring tool. Places rings 1” below the deck to get past head bolt distortion. Simple to use with or without head studs in place. Fully adjustable: Change squaring tool bore sizes quickly from 2″ - 5″ without any other tools. Made of anodized aluminum and stainless steel hardware, this tool is designed to withstand a lifetime of use in any professional or home shop environment. Lifetime warranty. To use: Loosen thumbscrews slightly and insert the three round pegs into cylinder bore until the bottom body of the tool rests flat against the cylinder deck. Slide pegs outward to gently meet the inside of the cylinder bore walls, and tighten thumbscrews. Remove tool and insert piston ring into cylinder bore. Use ring squaring tool to push ring down evenly until body of tool is flat against cylinder deck. Easy!