Vials, Screw Top, Glass. Clear, 2ml, with Write-On Patch and fill lines, 9-425mm threads, 12x32mm outer dimensions. For use as an autosampler vial. RSA Brand. Additional Info: First hydrolytic, Class A, Type-33 Reduced Surface Activity Borosilicate Glass. Write-On Patch and fill lines are ceramic and will resist smearing or scratching when working with solvents. Bottom depths and heights are designed and QC controlled for maximum recovery and needle safety. Low adsorbing and will not add Na to sample solutions or compounds that cause pH changes.