4PCS 23.6 in (600 mm) T Slot 4040 Aluminum Extrusion Anodized Linear Rail Modular Design Excellent Corrosion Resistance Enhanced Stability High Compatibility Reduced Friction High Compatibility Number of Pieces: 4,Item Model Number: 4040-60-4,Surface Treatment: Anodized,Material: 6063-T5 Aluminum Alloy,Compatible T-Slot Nut Sizes: M6, M8,Product Dimensions: 23.62 x 1.57 x 1.57 in / 600 x 40 x 40 mm,Center Hole Size: Φ0.26 in / Φ6.8 mm,Net Weight: 5.84 lbs / 2.65 kg (Includes 4 pieces)