These Rail Tees, Elbows, & Bow Forms can be attached to railing with set screws or pop riveted using stainless or aluminum rivets. Includes set screws where appropriate. Set screws can be purchased separately (299999-1). Requires 1/8" Allen wrench to install. Mounting hole in 110° Bow Form is designed to fit 1/2” diameter flagpoles. Constructed of corrosion resistant investment cast 316 stainless steel. * Stainless tube wall thickness 0.049".