... 4.CNC 110V PCB Milling Desktop Machine (300*300mm) Applications:Can be used for advertisement engraving, ... : Whole cast aluminum/iron2) Work dimensions: 300*300mm,400*400mm,600*600mm3) Driver type: Stepper motor4 ... motor14) Spindle speed:0 - 24, 000rpm15) Blade diameter:3.175,4,6mm16) Control system: NCSTUDIO or DSP ... materials,pls tell us the material diameter.We have 300*300mm, 400*400mm, 600*600mm or ...