Using this Milwaukee OPEN - LOK™ sealant cutting blade set is easy. First, make sure your oscillating multi - tool is turned off and unplugged. Attach the blade to the tool according to the tool's instructions. When you start cutting, move the tool side - to - side for best results, especially when dealing with sealants in expansion joints. For narrow channels, the raised OPEN - LOK™ anchor helps you get deep and flush cuts. As for maintenance, after each use, clean the blade with a dry cloth to remove any sealant residue. Store the blades in a dry place to prevent rust. And always remember to wear safety goggles to protect your eyes while using the blade.