The AC27-P lock-in paint cup is great for trim painting and cut-in applications. With a built-in magnet to secure a paint brush, the paint cup holds 1 qt of paint. For use on ladders that include lock-in system sockets, it can be used with disposable paint cup liner AC 27 L. Werner Plastic 5.9-in Paint Cup For Ladders and Scaffolding in Blue | AC27-P