Aluminium Sloping Wall Copings 90 Degree External Angle Alumasc Skyline - Mouse Grey (7005m)Aluminium Sloping Wall Coping: 90 Degree External Angle The Alumasc Skyline aluminium wall coping system provides a quick, easy and cost effective solution to finishing upstanding parapet walls on flat roofs. Each 90 Degree angle is supplied with 1 and a half strap fixings which secure to the top of the wall allowing for the coping to simply click down into place, avoiding the need to penetrate the finished surface while maintaining air movement over