3M(TM) SR Cutter No.8, Plastic, 53/64" Diameter x 1-1/64" Length, 1/4"-28 Thread, Amber  (Pack of 5) Minimal or no abrasion to paints, primers, or metal on aircraft. No chemicals to apply, clean up, or chemical waste in addition to removed sealant Less time to do the job Increases productivity Easy to use Removes sealants and coatings cleanly with minimal or no abrasion to underlying paints, primers or metal Easy-to-use cutter attaches to a rotary tool to replace time-consuming hand scraping with metal scrapers that gouge the workpiece Cleans without chemical solvents, eliminating chemical mess and waste Metal mandrel fits a right angle power tool No. 3 cutter is for flat applicationsits 0.4" diameter fits between rivets and into tight spaces No. 8 cutter is 1" in diameter and has an internal cavity designed to fit directly over rivets or other protrusions for thorough cleaning Primarily used in the aerospace industry