Engine Piston Ring Squaring Tool Billet Aluminum Natural Anodized Fits 4.00-4.230 Inch Bore Sizes ProformGet your piston rings aligned the first time! Just simply press piston rings down for perfect depth every time. Sold individually. Product Details: Engine Piston Ring Squaring Tool Fits 4. 000 Inch To 4. 230 Inch Bore Sizes High Quality Billet Aluminum With Silver Anodized Finish Helps Eliminate Guesswork and Ensure Accurate Piston Ring Alignment Patented Design Sold As Each