Estes Performance Concaves

The Original RPR Concave System by CM Welding, Donnie Estes located in Frankfort, Indiana. Over the years thousands of farmers have purchased from CM Welding, and `come by the shop` where the RPR calls home. The RPR Concave system was designed, tested and patent of the 90 degree bar filed in 2012. Distributed by Estes Performance Concaves and dealers worldwide.