The Best Lock 9K PRO Installation Templates prep doors for heavy duty Best 9K Series lever locks with the ability to drill the post holes at 12 6 o'clock. Made from solid aluminum, featuring steel hardened bushings and an a black anodized finish. The Best Lock 9K PRO Installation Templates prep doors for heavy duty Best 9K Series lever locks with the ability to drill the post holes at 12 6 o'clock. Made from solid aluminum, featuring steel hardened bushings and an a black anodized finish. Includes (2) Installation Templates shown for inside and outside door prep Use with the Professional Series Universal Clamp (INCL-PRO)f.