American Fluid produces alum radius blocks for Parker 420 Bender as well as Parker 412 Bender. This radius block is a 1 1/2 x 4 and is available in various sizes. AFP produces all the radius blocks on site and cuts them from a piece of 6061 aluminum or from castings. AFP produces the radius blocks and slides for the 412/420 benders. AFP makes several custom sizes as well.