1.Easy to install: This threaded adapter sleeve is easy to install, just push, twist and turn until it's fully inserted.You can easily screw it into the swimming pool deck or splash deck. 2.Proper Size: the pool umbrella stabilizer has an inside diameter of 4 cm/ 1.57 inches and a height of 3.5 cm/ 1.38 inches, suitable for mounting the 1 3/4 inch umbrella insert on your pool deck. 3.High quality materials:The umbrella sleeve adapter for pool is made of quality plastic material, UV resistant and corrosion resistant. 4.Convenient and practical:The umbrella pole stabilizer is lightweight and small,convenient to carry and use,can effectively stabilize your swimming pool umbrella from wobbling or tilting.This simple adapter works perfectly to hold pool umbrellas upright and secure. Simply unscrew cap on pool umbrella sleeve and screw in the adapter. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.