This will go over cylinder bores up to 4-1/2in. 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. Product Features:Dial Indicator Not Included and Sold SeparatelyWill Fit Over Any Cylinder Bore Up to 4.500-in. esMade from High-Quality AluminumMagnets Built Into The Aluminum Bridge Legs
