Get your piston rings aligned the first time! Just simply press piston rings down for perfect depth every time. U.S. Pat. 6,042,456. Sold individually.
Product Details:

• Engine Piston Ring Squaring Tool
• Universal Model
• Fits 4.000 Inch To 4.310 Inch Bore Sizes
• High-Quality Billet Aluminum With Natural Finish
• Helps Eliminate Guesswork and Ensure Accurate Piston Ring Alignment
• Patented Design
• Sold As Each