The DuraMark ChalkShot Pen is your one-step marking tool for any surface it even marks drilling locations through templates up to 2 in. thick. Utilizing a high vis green non-permanent pigment, Chalkshot works on metal, wood, tile, plaster, drywall, stone and concrete making it easy to locate your fastening or drilling point. With over 250 shots in every canister the ChalkShot Pen will save you time and money while improving your accuracy on the job site or around the house. The pen works at any angle, even overhead. Give it a shot.