The Lisle Master Line Stopper Set, No. 67000, includes four stoppers to seal lines in automotive flare-type steel brake lines, power steering and transmission cooler lines. The set contains two line clamp pliers, 6-1/4" and 7-1/4" in length, to seal flexible brake lines, fuel and vacuum lines, with smooth rounded edges that will not damage internal hose reinforcement. Eight stoppers and four caps are made of highly visible, flexible plastic and used for plugging vacuum and fuel lines during engine tune-ups. The stepped design can be used for both internal and external stoppage. Stopper sizes range from 1/8" through 1/2" while caps are 5/8" and 3/4" for larger lines.