Description: Versatility, fit for photovoltaic roofs, photovoltaic ground, photovoltaic shed and photovoltaic,application of protection and grounding for solar photovoltaic systems in vegetable greenhouses. Quality and reliability. It is suitable for various installation environments. Strong compatibility, aluminum guide rail, photovoltaic car shed and C steel (U steel) guide rail matching. Specification: Material: stainle steel Size Chart: Size:Approx.40x5mm/1.57x0.20 inch Package Includes: 50 pcs/pack Earthing Washer Note: 1.We provide clear pictures, measurements where poible. Please check as much as poible to make sure the item is the that you need. 2. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you.