Tisch Scientific 250 µL Micro-Insert, 31 x 5 mm for 8-425 Vials, Flat Bottom, 100 Pack, CV2049 Flat micro-Inserts from Tisch Scientific are designed to assist in the consistent sampling of low-volume chromatography samples. Regular Price $7.12 Price $6.19 Add to Cart Questions? Contact us via live chat, support@tisch-env.com or call 513.880.8499.