Replacement Power Pak Handle Assembly for Springer Magrath Stock Prod. Grooved finger guide allows finding the switch by feel, even with gloved hands; rubber switch insulator prevents feedback. Precious metal battery contacts wont corrode, and heavy coil spring assures firm battery contact. Four high-energy, longer lasting alkaline batteries included. Housed in a tough, structural-grade plastic case for reliable service. Shafts in several lengths sold separately.