This is an optional search coil for the Makro Racer metal detector. This Search Head measures 5'' x 4.5'' (13 cm x 12 cm) in diameter. This Double D coil comes standard with the Racer metal detector Pro package. This is a small sized coil that will detect individual targets such as coins, gold nuggets, relics and jewelry with great pinpoint accuracy. (Ships complete with search coil cover and hardware.)