Strong Umbrella Stabilizer - With these stabilizers, the umbrella pole will fit in the stand base more tightly, which helps avoid potential accidents or damage to the umbrella. Easy to Install - Setup takes only 2 minutes. 3 Steps: 1. Place the base stabilizer into the bottom of the umbrella stand base. 2. Choose the correct size from the two included ring parts (separate them first), and place it on top of the stand base. 3. Insert the umbrella into the base, and use the provided thread to tighten it. Wide Application - The umbrella hole ring plug is suitable for most umbrellas, including beach umbrellas, market umbrellas, and traditional patio umbrellas. The durable material allows the adapters to be used in various environments such as the beach, balcony, backyard, and poolside. Material: Metal + plastic. Color: Black. Package Contents: 1 x Replacement Parts kit (8 pcs). Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.