This is a 3-pack of brake line switch blocks in chrome.  Overall length is 1.3".  The switch body dimensions are:  .700" long and .750 OD with a 1/8 NPTF brake light switch hole.  This is to be used with other BYO^® brake line products only.

*BYO^® brand brake hose and components have been specifically designed to work ONLY in conjunction with each other. Use with any other Magnum brake line products or other manufacturer’s brands will NOT pass FMVSS-106 criteria and will void all warranty, performance, and liability claims.