The Quad Lock® Universal Adaptor can be directly adhered to smartphones, cases and most flat metal or plastic surfaces, and is compatible with all Quad Lock® Mounts. The Patented Dual-Stage Lock makes it quick & easy to attach / detach your device, whilst giving you the peace of mind to know your device is securely locked. At just 5mm thick, the Quad Lock® Universal Adaptor fits seamlessly onto the back of smartphones and cases. The Quad Lock Universal Adaptor uses a 3M™ VHB 4952 Adhesive which will adhere to smooth, non-textured, non-porous surfaces such as: Plastics such as PC, ABS, PVC, Nylon, Acrylic Non-painted metals Un-coated glass We highly recommend using a case with the Universal Adaptor if your phone has a glass back. Please ensure the substrate is thoroughly cleaned and dry before applying the Universal Adaptor. The alcohol pad, which is included in the scope of delivery, is ideal for this.