This C strut channel connector extend bracket is suitable for 1/2” bolts with 1-5/8” strut slots. It is made of Carbon Steel Electro-Galvanized Q235 material. The 2-way channel cross section and 4-hole square shape make it a perfect 90-degree fitting C connector bracket. For more detailed size information, please refer to the attached size pictures. If you have any questions or need further assistance regarding this product, please feel free to contact us. We assure you that we will actively solve any issues and provide the best service possible. For more items related to the P1000, P1001, P5000, P5001, P5500, P5501, and all 1-5/8” or taller strut channels, kindly scroll down to the product detail page.