AL 7-77-00110U Urethane Version Of 844892 for American Lincoln. Polyurethane blades are commonly used for special situations where heavy oils or chemicals exist. These urethane blades are also very abrasion resistant and can be used in glass manufacturing facilities, bottling plants, or other areas where broken glass may be an issue. These can also be used on concrete sidewalks and similar abrasive surfaces. Blade has 5 mounting holes. Priced Each. Replaces American Lincoln 7-77-00110U. Our Part Number AL 7-77-00110U