This MMM3240 1-1/4 inch (42X40MM) bi-metal universal fit oscillating multi tool plunge blade works with your multifunction power tool for making fast, clean plunge cuts. Aggressive teeth make high speed cuts in aluminum, copper pipe, brass, nails, wood, drywall and plastic and the bi-metal blade material can even cut metal. The thin blade is great for detail work and is designed with a universal arbor that fits most oscillating multi tools. Its ease of use, versatility and problem solving capabilities make the Multi Tool system the perfect tool for crafters, hobbyists, do-it-yourselfers and trade professionals.