Different sawblade systems for jigsaws

There are 2 types of blade system: T-shank (1) and U-shank (2). The names refer to the shape of the blade's top, that you put into the tool. Some jigsaws only take T-shank blades and others only U-shank blades, while some take both blade types. When you need new blades, first check which type your jigsaw uses.