Hey folks with Intermatic timers! These metal trippers are exactly what you need if your mechanical timer isn't turning on and off like it should. The TMHDTRIP 156T1978A set comes with two on trippers and two off trippers - perfect for setting up multiple on/off cycles throughout the day. The metal construction is way more durable than plastic trippers, so they won't break or wear out as quickly. Each tripper measures about 6 inches long by 4 inches wide, with a slim 2/7-inch height that fits perfectly in timer channels. The whole set only weighs 0.1 pounds, but don't let the light weight fool you - these are sturdy and built to last. If you're using mechanical timers for lights, pumps, or other automated systems, having reliable trippers is crucial for maintaining your schedule. The installation is straightforward - just slide them into the timer channels at your desired times, and you're good to go. Much cheaper than replacing the entire timer unit, and often it's just the trippers that need replacing anyway. The quality is exactly what you'd expect from Intermatic - a brand that's been trusted for decades in timer and electrical components. Whether you're a homeowner maintaining your landscape lighting system or a professional electrician working on commercial timers, having spare trippers on hand is just smart. They help you create custom schedules for whatever you're automating, and the metal construction ensures they'll hold up through years of use. Keep your automated systems running smoothly with these reliable replacement trippers!