Description: 1.This Master Cylinder Adapter Set includes 12 adapters all designed to work with Brake Fluid Bleeders, so you can easily remove and refill fluid into your entire brake system on your own. 2.Compatible with a variety of master cylinder reservoirs, this adapter set will help you get the job done on nearly any brake system. 3.This Master Cylinder Adapter Set includes one rectangular adapter for Chrysler and for GM vehicles, one adapter for Toyota and for Lexus vehicles. 4.And ten round adapters with the following internal diameter sizes: 29mm, 34.5mm, 42mm, 43.5mm, 47mm, 49.5mm, 50.7mm, 56mm and 74mm.