Lisle 67000 Master Line Stopper Set The set includes four stoppers to seal lines in automotive flare type steel brake lines, power steering and transmission cooler lines Two line clamp pliers 6-1/4" and 7-1/4" in length seal flexible brake lines, fuel and vacuum lines, with smooth rounded edges that will not damage internal hose reinforcement Made of light weight and highly visible, fluid resistant nylon reinforced plastic Eight stoppers and four caps are made of highly visible, flexible plastic and used for plugging vacuum and fuel lines during engine tune-ups Stepped design can be used for both internal and external stoppage; Stopper sizes from 1/8" through 1/2"; Caps are 5/8" and 3/4" for larger lines