This will go over cylinder bores up to 4-.50 Inches. This is used to check piston-to-deck clearance, and it is magnetic so it holds firmly in place. Dial indicator 66962 is sold separately. This item sold individually.
Product Details:

• Magnetic Deck Bridge Tool
• Dial Indicator Not Included and Sold Separately
• Will Fit Over Any Cylinder Bore Up to 4.500 Inches
• Made From Quality Aluminum with a Red Anodized Finish
• Magnets Built Into The Aluminum Bridge Legs
• Sold As Each