Drill straight holes with a portable drilling guide | Kreg Tool
Drill jig for precise hole position and straightness. Had a couple dozen of these blocks I needed the hole in an exact location, don't own a drill press and by hand these
Make a drill jig for drilling the end of boards - WorkshopTherapy.com
Kreg EdgeDrill - Self-Centering Drilling Jig for 1/2 Inch and 3/4 Inch Material with GripMaxx Anti-Slip Surfaces in the Woodworking Tool Accessories department at Lowes.com
Create a Simple Jig for Drilling Perpendicular Holes of the Same Depth - YouTube
How to Drill Straight Holes With a Hand Drill (Using Lego) : 3 Steps (with Pictures) - Instructables