Bi-metal hole saws for wood and steel doors. Includes: Self-centering jig for perfect hole alignment with mounting holes to secure jig and match the latch plate holes. 2-sided jig template includes 2-3/8" and 2-3/4" backsets. 1-3/8" depth of cut. Kit contains (1) 1" and 2-1/8" hole saw, on pilot drill, plastic self-centering jig, steel trim plate template, and brass router bit.