Description: Material: Made of high quality aluminum alloy with acrylic material, stably. Wide Compatibility: 5 Roller positions are adjustable, setting range is 20mm-80mm. Compatible with desktop engraving machines. Designs: The aluminum alloy gasket is perfectly combined with the screws, overall appearance is beautiful. Applications: Great for engraving cylindrical objects such as cans, pens and cups, bottles, pipes, bowls, etc. Simple: No installation, no adjustment required, ready right Notes: Tear off film before use to provide enough fiction. Specification: Material: Acrylic, Aluminum Alloy Step Angle: 1.8°±0.09 Phase Number: 2 Rated Voltage: DC3.6V Rated Current: DC1.5A/phase Phase Resistance (20 Celsius): 2.4×(1±15%) Ω/phase Phase Inductance (1khz): 3.7×(1±20%)mH/phase Holding Torque: ≥420mn.m Detent Torque: 15 Mn.m Steering (Shaft Extending to Look): Clockwise Maximum Starting Frequency: ≥1500pps Maximum Operating Frequency: ≥1900pps Insulation Resistance: ≥100mΩ(DC500V) Electric Strength: AC600V/1mA/1S Insulation Grade: B Grade Moment Of Inertia: 57.3 g.cm² Weight: 255g Size Chart: 30cmx8cmx6.5cm/11.81inchx3.15inchx2.56inch Package Includes: 1 Piece Laser Rotary Roller Note: Please allow slightly errors due to manual measurement and different monitors.