Diffraction Grating Slide Linear 1000 Lines mm 2x2" Pack of 10 sold2025 These general use flat washers Style:10KAIC These general use flat washers are positioned under the head of a bolt or nut in order to provide a smooth bearing surface and distribute the fastener load over a wider area Multi scene use A good phone holder that can be used anywhere you want Makes the study of light and color fun and unforgettable Features highly efficient embossed Holographic Optical Elements Used for the direct viewing and analysis of spectra from different gas tubes and other light sources Spectrum produced from our gratings is the brightest possible with a minimum of distracting visual noise Great for overhead projector or 35mm slide projectors Diffraction Grating Slide Linear 1000 Lines mm 2x2" Pack of 10