Bosch TS1020 Dual-Activation Cartridge Dual-activation cartridge unit  two single-shot cylinders for two separate activations with each cartridge Easy system reset  takes less than 60 seconds after blade drop, with no damage to the blade Wide-ranging blade compatibility  works with nearly all standard 10-Inch fine finish and construction-grade blades and stacked dado blades Jobsite tested  shown to work in dusty, tough jobsite conditions Designed for a 20-year shelf-life  each of the dual-activation cartridges has an expiration date printed on the cartridge