Feature: Suitable for 190-540nm (33mm/40mm 60mm) blue-violet lasers. It is suitable for most laser applications. Designed for a perfect fit. Application: Quad-band Nd:YAG lasers/He-cd excimer lasers/YAG lasers/semiconductor lasers. An essential accessory for eye protection from laser exposure, providing complete protection from green laser light, portable and durableThis product adopts the latest plastic bonding technology, so that the protective case can be firmly attached to the lasers without tightening screws. During installation, tilt the lasers down 45 for easy installation of the lasersDetails:Red Safety GuardProtected wavelengths: 190nm to 540nm. Visible Light Transmittance: gt; 55%. Protective properties: completely absorbed. Attenuation: (10-6 lt; N % lt; 10-4). Optical Density: gt; 5.0, (OD+5, OD+6). Please click on the green safety coverApplicable models: wavelength 200nmBlue lasers visible light transmittance: lt; 50%Red lasers visible light transmittance: gt; 60%Protective Properties: Full AbsorptionProtective Wavelength: -nmVisible Light Transmittance: 60%Optical Density: OD4+T(405nm-450nm)= 15%Package Included:1*Safety Cover