17mm 28mm Optical Glass Plano-convex Aspheric Condensing Lens Projector Lamp Lenses Specifications: Material: H-K51 optical glass Packing checklist : 1 PC Lens Application: utilized in various fields similar to projection, security, vehicle, electronic camera, laser, optical instruments, and many others Specifications of Outer Diameter 17mm: Outer diameter:17mm Inner diameter:14mm Height:7 Edge thickness:3 ********************************************************************** Specifications Outer Diameter 28mm: Outer diameter:28mm Inner diameter:23 Height:12 Edge thickness:3 Professional processing Various lenses, prisms Can be personalized consistent with visitor requirements or drawings