Bosch’s Sealant Knife accessory is designed to be used with an oscillating tool to cut through thick beads of silicone and urethane sealant. The 3-inch blade cuts along an edge or makes a plunge cut. Because of the versatility of the oscillating tool interface, the blade can be positioned at any angle, making it appropriate for corners and other tight spots. The thickness of the blade keeps it rigid during cuts, and it can be sharpened. It is compatible with the Bosch OIS interface system, and the maker says it works with most other oscillating tools. Price: $30 / COO: Switzerland /