Stores 1,500 needles Use with 28G through 31G needles Portable Removes used insulin syringe needles and pen needles safely and easily. A worldwide leader in diabetes care Portable Stores 1,500 needles Device can be used with 28G through 31G needles 3/16" (5mm) through 1/2" (12.7mm) length needles Not intended for use with lancets.