The tail cap switch is high-quality. Threads easily to the back of the light, and has a great tactile feel when activating the switch. Compatible with Streamlight Stinger DS Flashlights Threads fit and have both a tail & top-of-cylinder on/off/strobe switch. The unit functions as it did before, but with an improvement. A good addition to a fabulous light - If you are used to most handheld light switches being located on the rear, this tail switch will fit your needs. Provides a second way to activate the light for your flashlight, rather than using the original switch located near the head assembly. Tail Cap Switch 75851 Replacement Parts For Streamlight Stinger HL , DS LED Flashlights Button Switch