Route the strike opening for Adams Rite MS 1851 dead locks with this template. Fastens to door jamb with two self-drilling screws (supplied). Alignment marks on template insures vertical and horizontal placement on jamb. Can be used on both offset and center hung doors. Requires the use of a router equipped with a 3/8" outside diameter template guide and a 1/4" router bit. (Part # for our router bit HIT-45RB4.)