Guides are made from special nickel alloyed steel that is heat treated for durability. Drill Straight - Every Time! Use on flat surfaces, round parts, and corners.

Use the 5/16" holes for drilling for binding screws or stainless steel or heli coil inserts with standard step drills. Tap ins use 5/16" straight bits. Use the 1/4" hole for stainless steel or heli coil inserts. The 21/64" hole works as reasonably accurate tap guide for stainless steel inserts.

It's like a portable drill press for precision alignment!

V-groove along the bottom of the guide allows for perpendicular alignment with all drill sizes on round parts and corners.

Bottom surface is precision ground to assure stability and accurate perpendicular alignment on flat surfaces.