Keyseat Wiper : A special reamer device designed to run in the drill stem assembly to enlarge the diameters of keyseats to the size of the drill collars. (Bul D20)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}