Westcott titanium bonded rotary replacement blade is compatible with Westcott titanium bonded 45mm rotary cutter. The titanium bonded blades are 3x harder than steel. The rotary cutter allows for quick and easy blade replacement. Creating your next masterpiece is easy when you have the very best tools to work with. Westcott, the leader in cutting technology brings you a coordinated assortment of all the essential tools you need to bring your ideas to life.