The RAM® Magnetic Power Plate™ III is designed to hold various devices including radar detectors and cellphones. The magnetic plate includes two powerful rare earth magnets, a composite cradle, and one adhesive metal plate. To mount your device to the magnet, you will need to attach the metal plate to the back of your device. Includes a rectangular 50mm x 38mm x 0.08mm metal plate with adhesive back.Features: Designed to hold a range of devices including radar detectors; rectangular metal plate attaches to the back of your device Magnetic plate features adhesive, two powerful magnets, and cradle Made of high-strength composites for durability and reliability in the most demanding environments Specifications: HOLE PATTERN: 4-Hole AMPS: 1.181" (29.9mm) x 1.496" (37.9mm) PLATE SIZE: 3.13" (79.5mm) x 4" (101.6mm) Hardware Included: x1 50mm x 38mm Steel Adhesive Plate x2 Rare Earth Magnets x4 #6-32 x 1/2" Machine Screws x4 #6-32 Nylock Nuts