Aluminum Oval Double Crimp Sleeves are 18mm long. Available 1.5mm,1.7mm,2.0mm,2.2mm,2.3mm,2.4mm,2.6mm,2.8mm,3.1mm,3.3mm,and 3.5mm ID. They are designed for line to make a loop, line to pace threw twice. Best to go up a size from line diameter and to cut you line clean with scissors or mono cutters. Some cutters like dykes will mash line and enlarge.