1The spindle adopts forced air cooling and can work for a long time. 2 Suitable for engraving PCB, acrylic, drilling, etc. 3 Can be used to engrave metal or non-metal materials. 43000-12000r/min high speed, low noise operation. 5. Chrome-plated surface, smooth texture, anti-rust and anti-corrosion. Status: Project type: Engraving machine spindle working voltage: 12-48VDC Power: 300W Speed: 3000-12000r/min (12V-3000 rpm, 24V-6000 rpm, 36V-9000 rpm, 48V-12000 rpm) Torque: 400mN.m Insulation resistance: >2 Megohms Insulation dielectric strength: 400V Diameter: approx. 52mm/2in Chuck Part Length: Approx. 35mm/1.4in shank, (43mm/1.7in including nut and core) Chuck part diameter: approx. 16 mm/0.6 in. Overall motor length: approx. 175mm / 6.9in (including clamping parts and motor) Spindle net weight: 0.8 kg / 1.8 lb (approx.) Spindle radial runout: approx. 0.02-0.05 .we-text form td,.we-text form th,.wang-edit -Text table td,.wang-edit-Text table th{border: .5pt Solid000;};.we-Text table,.wang-edit -text table{border: 1pxsolid000important;}1 x Spindle Please note that this product New models and old models will be sent randomly, please make sure you don't mind before ordering.