Midwest Tool and Cutlery Co. has introduced Interchangeable Blade Seamers for the HVAC/R and building/construction trades. The MW-S36 model seamer comes with 3- and 6-inch forged steel blades. The MW-S59 has 5- and 9-inch aluminum blades. The MW-S36 blades are rated for up to 22-gauge cold rolled sheet metal. The MW-S59 rust-resistant aluminum blades are rated for up to 0.030-inch aluminum. (800) 782-4659; www.midwestsnips.com.