linear guide rail
15:12 inch/GT300 * 200 (double top wire)
16:12 inch/GT300 * 300 (double top wire)
17:12 inch/GT300 * 400 (double top wire)
18:12 inch/GT300 * 500 (double top wire)
19:12 inch/GT300 * 600 (double top wire)
20:12 inch/GT300 * 700 (double top wire)
21:12 inch/GT300 * 800 (double top wire)