【Application】Great fixture for squaring rings in the bore prior to setting end gaps. 【Notes】Places rings 1” below the deck to get past head bolt distortion. Quick Tips: Measuring ring gap using a piston ring squaring tool Places rings 1” below the deck to get past head bolt distortion How to use: 1., 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., 2., Slide pegs outward to gently meet the inside of the cylinder bore walls, and tighten thumbscrews., 3., Remove tool and insert piston ring into cylinder bore 4., Use ring squaring tool to push ring down evenly until body of tool is flat against cylinder deck. Piston Ring Squaring Tool for End Gap Applicable: Covers bores from 2″-5″ so that you can consistently and accurately measure piston ring end gap. Piston Ring Squaring Tool, 3.736 to 3.810 Bores 91089423 Proper piston ring end gap Feature: No extra tools required. 【Function】Set piston ring end gaps accurately, consistently and with repeatable results by using this Checkered Flag Performance universal ring squaring tool. Simple to use with or without head studs in place. Engine Building Tool QGHAUC 7075 Billet Aluminum Engine Piston Ring Squaring Tool Fully adjustable: Change squaring tool bore sizes quickly from 2″ - 5″ without any other tools.