Strong Umbrella Stabilizer - These umbrella base parts are made from of high quality HDPE plastic. It is strong to stabilize the market umbrellas to resist heavy wind and storm. With using these stabilizers, the umbrella pole will fit in the stand base more tightly that avoids potential accidents or damages to the umbrella. 8-Pcs Value Pack - The package contains 2 packs of base parts. Each pack includes a 1.9” adapter, a 1.5” adapter, a base stabilizer and a M8 thread. The adapters will fit majority types and sizes umbrella. Easy to Install - Only 2min 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 stuff it on the top of stand base. 3. put the umbrella into the base, and use the given thread to tight up. Wide Application - The umbrella hole ring plug is suitable for most umbrellas such as beach umbrella, market umbrella and traditional patio umbrella.