Hydra Pools HC3115 12' Straight Coping Bullnose Rimlock: Bullnose Coping is the most popular style of coping used in vinyl liner pools. It allows you to pour concrete all the way up to the edge of your swimming pool, giving you a great finish. Made from the finest extruded aluminum, our Bullnose coping comes in a non-slip, textured, white, electro-static paint. Available in Rimlock and Caplock, our Bullnose coping comes with matching lock-on clips, and our exclusive Caplock design encapsulates the entire top surface of the wall panels for precise alignment and stability.