Bullnose Paver The perfect finish to a beautiful pool patio or landscape, the Unilock Bullnose Paver is the perfect compliment in texture and color to all of our fine paving stones shapes. The Unilock Bullnose Paver is designed to be set into mortar for use as a pool coping or stair tread. It is reversible so you can use it with the bullnosed or square side as your finished edge.