5pcs x 8.5MM high power LED lens for 1W 3W LED with a smooth convex lens Outer diameter: 8.5MM Inner circle diameter: 7.8MM Height: 2.8MM Step height: 1.0MM Step height: 1.0MM Light transmission rate: 93% Focal length: 7.5MM Beam angle: the angle can be adjusted Material: imported PMMA package included:5pcs x Special high power 9MM LED square convex lens diameter 9MM smooth (square spot)