We recommend screws that are less than 10mm in length. Product Name: Automatic Screw Arrangement Machine Product model: GS8 Power Type: Electric Type Loading screw amount: 160-459 holes Arrangement time: 3-4 seconds Socket type: Type-c Gears: 3 gears Applicable screw disk specifications: 140 x 90MM Input voltage: 5V Applicable screw specification: 1.0-4 Input current: 2A Operation instructions: Slide the power supply left, and then the M key to start the vibration (the M key can adjust the vibration frequency and stop the vibration). If the screw cannot fall, the vibration amplitude can be adjusted Color: Grey Material: Plastic+Metal Package Contents: 1 * Screw Arrangement Machine Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.