A: A better bottom line. Sonde housing sits just 30" behind the bit for the most accurate tracking in the industry. 4.00", 5.75", 6.75", and 8.00" mud motor options to fit your job. For more information about Hunting products, contact your nearest Hunting dealer or call (833) 367-9296 For more information about Underground Magnetics products, call (913) 626-7654