Use Suggestions: Please loosen the fixing screw on the trip unit, slide the trip unit onto the timer dial, perform the on/off action at the desired time, and then tighten the fixing screw; please make sure the time under the current time pointer is correct. Please note that our product is not sponsored or endorsed by, or affiliated with the brands it fits, including Intermatic. Sufficient quantity can meet your needs. Easy to Use: Our product comes in two colors, you can easily tell which one is open and which one is closed. Time Switch Replacement Trippers Kit/Pool Timer On Off Clips for Inter-Matic 156T1978A for T100 Series Timers, Easy Setup for Precision Time Control (8 ON /8 Off /16 Screws Intermatic Timer Parts Time Switch Replacement Trippers Kit Compatible With Intermatic 156T1978A For T100 Series Pool Timer ON Off Clips Intermatic T100 Replacement Trippers For automatic timer switches T100 series, use 1 silver ON trip unit with J letter and 1 gold OFF trip unit with J letter. For other models, use 1 silver ON release unit and 1 gold OFF release. Specification: Color: gold, silver Material: stainless steel Product Size: as seen as in the detail picture Package details: 12 x time switch replacement trippers 12 x set screwsNote: Due to manual measurement, the size and weight may have a certain error.