Zona 35-140 4-in-1 Saw Set with Four Interchangable Blades, 36-555, 36-050, 36-458, 36-408 4-in-1 Saw Set With Three Interchangable Blades, 36-119, 36-129, 36-408 Removable, replaceable blades attach with a knurled nut. 11 overall length