Strong Umbrella Stabilizer - With these stabilizers, the umbrella pole fits into the stand base more tightly, avoiding potential accidents or damage to the umbrella. Easy to Install - Only 2 minutes to set up. 3 Steps: 1. Put the base stabilizer into the bottom of the umbrella stand base. 2. Pick the right size from the included 2 sizes of ring parts (separate them first), and place it on top of the stand base. 3. Put 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 such as beach umbrellas, market umbrellas, and traditional patio umbrellas. The strong material allows the adapters to be used in various situations such as 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 real thing. The measurement allows an error of +/- 1-3 cm.