Features: Solar pv grounding for protection system spacer, it is made of 304 stainless steel with strong corrosion resistance. Versatility, fit for photovoltaic roofs, photovoltaic ground, photovoltaic shed and photovoltaic,application of for 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. Specifications: Material:Stainless Steel Size: Approx.2.5x4.8cm/0.98x1.88inch Color: Silver Package Includes: 50 Pieces Grounding Gasket note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.