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. The length is 50mm. The width is 7.5mm. Thickness is 1mm. TPI is 24. Tooth is Regular. Set is Wavy. Length dimension references tooth bearing section of the blades, the total length including shank is approximately 25mm longer.