Tracker Series Safety Glasses, Clear Lens, Clear, Black Frame, Foam, Rubber ORS NASCO A low viscosity retaining compound A low viscosity retaining compound that bonds rigid metal assemblies Easily joins dissimilar metals flat on opposite Flat sides of all half round files are double cut Backs of all 4 in and 6 in files are single cut Backs of all half round second cut files are longer than 6 in are double cut Tinted lens reduces eye fatigue and eye strain caused by blue light Available in a variety of lens options for indoor and outdoor use Rubberized eye seal provides exceptional protection against dust and other particles Adjustable headstrap improves fit and protection Can be fitted with an Rx prescription lens adapter while maintaining impact protection approval