Check the listing for details. Aluminum Engine Piston Ring Squaring Tool for End Gap, Fit 2" to 5" Bores. Condition: New. Listed at 21.97 USD. 【Application】Great fixture for squaring rings in the bore prior to setting end gaps. Applicable to many cover bore sizes from 2″ to 5″ so that you can consistently and accurately measure piston ring end gap.【Material】Made of anodized 7075 aluminum and stainless steel hardware with strong corrosion resistance and wear resistance, this piston ring squaring tool is designed to withstand a lifetime of use in any professional or home shop environment.【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.【Notes】Places rings 1'' below the deck to get past head bolt distortion. Easy to use,Simple to use with or without head studs in place,no wrenches or other tools are required. Fully adjustable.