Cee-San Ditch Magnets are constructed with a string of potent magnets totally enclosed in high quality stainless steel housing. This enables our Ditch Magnet remove the maxium amount of metal particles from drilling mud. Cee-San Ditch Magnets are available in; 18,24,30,36,42, and 48 inch lengths. For more information please contact Logan Oil tools @ (281)219-6613