Shadow Line Stopping Angle Shadow line stopping angle is made of the high quality galvanized steel. The product used in the joints of the wall meet the doorcase and the ceiling meet the partition wall make the corner straight and firm.Installed horizontal or vertical. Specification: Edge:10mm/30mm Length:3m How To Use: Embed the shadow line stopping angle into the joint,fix with the Self Topping Screw.Smooth with compound.