Notice：don't need to set VFD，please use it directly Package include: 1x 110V/1.5KW Square Spindle Motor+1x 1.5KW/110V YL INVERTER+7x ER11 Collets Specification property：Run out off: less than 0.005mm,spindle speed:0-24000rpm, AC Inverters 50/60hz single phase / 3 phase ，0-400Hz，Inverter input：single phase or Three phase，Inverter inout：Three phase，spindle motor input：Three phase Bearing is P4 grade, 2x7005C P4 DT, 2x7003C P4 DT, increase spindle life High-speed electric main bearings used in all C class high-speed angular contact ball bearings, axial pre-load feature, improved support stiffness and live spindle grinding accuracy under high-speed rotation. Main Application: engrave for wood, bamboo, normal PCB, PVC, PMMA, plastic, duotone board(ABS)and etc nonmetal, also can engrave on gold, silver, copper, aluminium, Pb etc soft metal surface working.