THIS IS A HANSFORD/DAVIS D-4310 KEYSEATER, FEATURING A PRECISE 10MM X 20AF TOOLING SOLUTION. THE UNIT UTILIZES A D-4310 KEYSEATER BROACH WITH SPECIFIC DIMENSIONS DESIGNED FOR PRECISION CUTS. THE BROACH SPECIFICATIONS INCLUDE A 10MM WIDTH, 1-INCH HEIGHT, 1/2-INCH PITCH, AND A 20-INCH LENGTH.