The searchcoil included with the AT Max is an 8.5” x 11” DD PROformance submersible coil. It’s a great size for all-round hunters searching for multiple types of objects. However, it’s compatible with all available AT searchcoils that includes a 4.5” Super Sniper coil, a 6.5” x 9” concentric coil, and even a large 9” x 12” concentric coil.