Fangrui Product Details Material: Metal . It Is Suitable For Machining Wood, Acrylic, Porcelain, Plastic, Aluminum, Iron, Steel And Other Materials Wiring Method: The White Line Receives The Control Card To The , And The Black Line Receives The Control Card G Terminal Color: Red + Black Type: Cnc Engraving Machine Tool Setting Block Diameter: (approx.) 40mm Height: (approx.) 20mm Usage: According To The Wiring Method Is Properly Connected And Control Panel For The Cutter, Alligator Clip And Connected To The Ground Of The Control Panel (alligator Clip Can Be Caught In The Spindle, But Must Ensure That The Spindle And Ground Wire Is Connected To Main Board), When The Cutter Device Of Cutting Tool, The Cutting Process Is Complete. Notes: When You Are Connected To The Cutter Block, Start The Device (but Do Not Start The Spindle Motor). Dont Be Too Eager To Clip The Alligator Clip On The Spindle, First Try To Touches The Face Of The Cutter With The Alligator Clip, Observe Whether The Z Axises Has A Reaction To The Cutter, Confirm