Template install CtoC DIM need ruler as below picture: Install to check fit/function or DIM need: screw driver, caliper, Tape,1/2” drywall (mounted on stud wood frame as below picture #1-3)vertical wood to wood distance: 16”(blue line);vertical wood width: 2” (green line); Horizontal wood width: 4” (red line)Pitcture#1 Picture#2 Picture#3