The 4-pack of CT_4PK 45° Impaling Clips from Auralex is for mounting a corner ProPanel product to create an air cavity for improved low-frequency absorption. The clips can be installed with standard drywall screws (sold separately), and they allow for quick panel placement on virtually any surface.
Use impaling clips alone for panels in low-traffic areas or when temporary mounting is necessary. Combine impaling clips and TubeTak Pro adhesive when permanent mounting is required.