Life Saver Pool Fence Ground Caps - Set of 24. They come in White, Tan, or Grey colors. 1" diameter. These pool fence deck sleeve caps are typically used for professionally installed pool fences. These caps are designed to fit inside a sleeve that fits into a 1-1/8" hole in the pool deck. They don't fit properly without the deck sleeve installed. DIY pool fence caps are smaller and these will not fit a DIY pool fence sleeve.