(2pcs/Set) Laser Focus/Collimator Lens Material:K9 (Glass) Diameter:30 38.1 41.5mm Focal Length:100 120 150 180 200mm 2pcs/set:1st Convex-Convex, 2nd Concave-convex Power:0-1000W If you have any questions about the products or shipping,please contact our ...