Celestron EclipSmart Solar Filter 6 SCT Brand New Includes Two Year Warranty The Celestron EclipSmart Solar Filter enhances your viewing experience for the 174 mm 184 mm Telescopes. With two Velcro straps and four self-adhesive Velcro pads for added safety, you can be assured that the solar filter cannot be accidentally knocked off and will provide Solar Safe, ISO compliant viewing. EclipSmart Solar Filter Features Product # 94243 Solar Filter Celestron Proprietary Mylar Filter Solar Safe Filter Technology Nylon Safety Straps Two 1 x 4 Velcro Straps Four 1 x 1 Velcro Tabs Filters 99.99% of Visible Light 184 mm External Filter Diameter 174 mm Internal Filter Diameter 24.0 mm Filter Thickness 128.5 mm Filter Clear Aperture ISO Certified