Gray Pool Fence Caps for use in a core drilled hole 1 1/8 inch diameter hole x 4 inches deep. Will work with 1 inch aluminum poles. Fits most 1 inch holes standard in sleeves. Will NOT work with 1/2 or 7/8 inch diameter holes. UV Rated for outdoor use to protect against becoming brittle and breakage. Held in place with friction no need for glue or adhesive. Tapered top for Pool Fence poles to sit firmly in the hole.