Quality Parting Tool ,Made from Quality Tool Steel. It is heat treated and machined to achieve precise tolerances. All surfaces are ground to make it square all sides. Nice ground finish before epoxy blackened to have a rust free life. Holder Size : 3/4" Width Blade Size: 3/32" x 1/2"x 4" Package include 1 Parting Cut Off Holder + 1 Blade HSS . No separate spanners are included because any standard tap wrench can be used to change the blade. Its a standard Hex Nut at the back side of it.