Black aluminum honeycomb louver cover Louvers can be trimmed with scissors and used with smaller light bulbs like PAR20 / PAR30 / PAR36 / PAR38 Reduces glare and hotspots in lighting fixtures Honeycomb louvers are a great for spot lights and flood light light fixtures Measurements 4.25" Long x 4.25" Width x 0.13" Height. Honeycomb louvers are made from high quality black colored aluminum. Honeycomb louvers help reduce glare and control light distributions to 40-60 degree light beam angle. The light distribution is reduced when the light travels through the the holes in the louver helping eliminate additional glares and hotspots from lighting fixtures and LED's. These lighting louvers are designed to be placed directly on top of the bulb cover glass or between the bulb and glass cover of the fixture. This Lighting Louver is made to be used with Halogen, Krypton, Xenon and LED type bulbs. Measurements 4.25" Long x 4.25" Width x 0.13" Height.