These side dot drilling guides will give you consistent dot placements in just a few minutes. Mark the top of the fretboard with a vertical line at the center of the fret and then simply place the jig on that line, viewing it through the triangular hole and drill it through the size-specific drill hole. These will place the hole just above the neck/fb glue joint assuming the fretboard is .250" PRE RADIUS. 3 different sizes included. 2mm, 3mm and 4mm. Please note: these are meant to be used BEFORE the fretboard is radiused.