Ray-JrMALL 4pcs Fishing Rod Holder Tackle Gripper Rest Thread New Plastic Black Product Description: 1.U-shaped head,front opening size:40MM,lenght:68MM. 2.Both protect the pole is not wear, and increased the anti-slip clip reed performance, the rod is not easy to slide. 3.Material:Nylon+304 Stainlee steel. 4.Ideal for all types of bracket to use.