CTA Tools 2027 Piston Ring Compressor for Cars and Light Trucks Features Ratcheting Mechanism with Square Drive Tool Allowing You to Adjust the Diameter Enlarged Crimped Edge Prevents Compressor from Entering the Cylinder Also Features Spring Steel Construction with Double Band Design Depth: 3-1/2-Inches or 89-Millimeters Range: 3-1/2-Inches  7-Inches or 89  178-Millimeters