Micro-inserts made of clear first hydrolytic class glass are suitable for screw neck vials ND8 with small opening.Clear glass, conical tip 15 mm** 0.1 31 x 5 1000 7613389Clear glass, conical tip 15 mm** 0.1 31 x 5 100 7639144Clear glass, conical tip 9 mm 0.1 31 x 5 1000 7616846Clear glass, conical tip, with polymer foot 0.1 29 x 5 1000 7614073Clear glass, flat bottom 0.2 31 x 5 1000