The Starrett BU224-5 Metal Cutting Jigsaw Blades with Unified Shank™. These blades will fit in virtually all jigsaw machines. These blades feature 170% more weld contact area than standard bi-metal blades through the Unique™ solid state diffusion bonding process. This ensures exceptionally strong teeth, combined with the multiple cutting edges and split chip advantage, ensure that these blades typically last 25% longer than directly competing products. Supplied in a pack of 5. Specification Length: 50mm. Width: 7.5mm. Thickness: 1mm. TPI: 24. Tooth: Regular. Set: Wavy. Length dimension references tooth bearing section of the blades, the total length including shank is approximately 25mm longer.