Get your piston rings aligned the first time! Just simply press piston rings down for perfect depth every time. U.S. Pat. 6,042,456Proform Engine Piston Ring Compressor 67652Specifications: Feature/Benefit Get your piston rings aligned the first time! Tool Type LS Tools Category Piston Ring Tool Finish Stainless Steel Description_ABR Ring Tool Description_SHO Piston Ring Tool Description_INV Piston Ring Squaring Tool Description_DEF Engine Piston Ring Compressor Description_ASC Engine Piston Ring Squaring Tool Description_ASC Universal Model Description_ASC 4.00in. To 4.310in. Bore Description_LAB Engine Piston Ring Squaring Tool Description_LAB Universal Model Description_LAB 4.00in. To 4.310in. Bore Description_DES Engine Piston Ring Squaring Tool Description_DES Universal Model Description_DES 4.00in. To 4.310in. Bore Description_EXT Engine Piston Ring Squaring Tool Description_EXT Universal Model Description_EXT Fits 4.00 Inch To 4.310 Inch Bore sizes Description_EXT Helps Eliminate Guesswork and Ensure Accurate Piston Ring Alignment Description_EXT Patented Design Description_EXT Sold Each Description_MKT 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