♬Make of Stainless Steel, sturdy, resistant to deformation, rustproof. ♬Two fine screw knobs can adjust the tightness of the tube to firmly fix umbrella. ♬There is a slot on plate where the base can be easily mounted on it, and the screw knob on the side of the tube can help reinforce the tightness between the base and plate. ♬With 4 screws for easy installation. ♬Great accessory for fishing lovers, light weight and portable.