Description It is a magnetic studs finder. Suitable for wood surface, wall surface, etcSuitable for wood surface, wall surface, etcSuitable for wood surface, wall surface, etcSuitable for wood surface, wall surface, etcSuitable for wood surface, wall surface, etc Features -Material:Plastics, magnets -Size:7.80X3.10X1.70cm/3.07X1.22X0.67in -Works with all drywall applications. Not intended for use on lath & plaster walls. -Finds wood and metal studs behind drywall by locating nails and screws in the studs. -No batteries required. Hangs on the wall hands free when studs are located. -Portable and light weight, easy to carry and storage. -Ergonomic sensor will help you find most objects.Package listing: 1 x magnetic studs finder