Micro-Insert, 31*6mm Clear, Flat Bottom, Suits for 10-425 Vials 250uL Conical Micro-Insert, 31*5.7mm, Suits for 10-425 Vials 250uL Micro-Insert with Mandrel Interior, & Aijiren 0.15mL Vial Inserts, Glass, Conical Base, 100 . Flat Bottom,Conical Base and Conical insert with a top spring Several styles are offered including flat bottom, concial