Package Content: 1 x 220V / 2.2KW Square Spider Motor + 1 x 2.2KW/220V UL Inverter + 13 x ER20 Spring Sleeves (1-13 mm)Specifications: Round error: less than 0.01 mm, spider speed: 0-24000 rpm, AC inverter 50/60Hz, Single Phase / Three Phone, 0-400 Hz, Inverter input: single phase or three-phase, inverter input: three-phase, spider engine input: three-phaseLayers are grade P4, 2 x 7005C P4 DT, 2 x 7003C P4 DT, extending the life of the spiderElectric high-speed main bearings, used in all C-class high-speed inclined ball bearings, with axial bias, enhanced support rigidity and grinding accuracy of the powered spindle during high-speed rotation.Main use: Engraving for wood, bamboo, normal circuit boards, PVC, PMMA, plastic, duoton plates (ABS) and etc. Non-metal, can also be engraved on gold, silver, copper, aluminum, Pb etc. on soft metal surfaces.