This steel umbrella holder features a large clamp opening for versatile attachment to various surfaces. Its quick-release design allows for easy setup and removal. The adjustable height and fixed screw ensure a secure hold. Perfect for providing instant shade at outdoor events and work. Backed by our quality guarantee and reliable customer service. Features 1. Clip - Large clamp opening can clip anywhere you like 0-5cm of thickness, attach to bleachers, benches, tailgates, boats, poles, boats, fences and more 2. Quick release: quick setup, quick release. Use for umbrellas, flags and fishing poles. 38mm diameter tube with thumb screw to firmly hold the umbrella and allows you to adjust the height 3. Fixed Screw: You can adjust the hole diameter by twisting the screw. The maximum thickness of the caliper is 5cm. 4. Application: The instant shade, anywhere that is perfect for the trunk, sporting events, outside work and recreation. 5. Quality Guarantee. We have faith in our product and always back it up with trustful customer service, please reach out to us if you have any questions or problems about our products. Specification Material: Steel Color: See Photo Package Includes: 1 x Umbrella Holder