[Powerful Magnetic]: The stud detector does not require battery power and is manufactured from magnets, which can generate 27 pounds of magnetic force. It can detect metal through 1/2 inch or 3/4 inch drywall or other thicker building materials. Works through ceramic tiling and up to 3/4 inch plywood paneling. [Quick & Accurate Metal Stud Finder]: The magnetic stud ball can locate studs and any iron products. When screws, sewing needles, keys, or similar iron objects fall into narrow gaps, this tool helps retrieve them. [Compact and Portable]: Our stud finder is small and portable, with a diameter of approximately 0.78 inch and a length of about 2.59 inches, making it easy to carry. It's ideal for decorators, contractors, and anyone who needs to find hidden studs. [Works for Most Scenarios]: This tool detects metal studs in various construction materials, including carpet floors (3/4 inch), plaster walls (3/4 inch), concrete walls (5/8 inch), ceramic tiling (3/4 inch), plywood paneling (3/4 inch), and wood frame walls (5/8 inch). Color: Black Material: Silicone + Metal Package Contents: 3 Pcs Stud Ball Magnetic Stud Finder Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.