OWC Multi-Mount For Mac or PC, 2.5 to 3.5 and 3.5 to 5.25 Hard Drive Adapter Bracket Set Designed for Use in Mac or PC; Install one 3.5" and one 2.5" HDD or SSD in a single 5.25" bay. Vibration dampeners reduce noise emittance from traditional platter-based drives. 100% powder-coated aluminum helps dissipate drive heat. Add more storage to your computer by securely installing smaller drives in larger bays. 1 Year OWC Limited Warranty One 2.5 to 3.5 Multi-Mount bracket set with four pre-attached rubber mounted drive screws for vibration control One 3.5 to 5.25 Multi-Mount bracket set with four pre-attached rubber isolated mounting posts (4) Fine Thread Bracket Mounting Screws for 5.25&#034; PC Bays Multi-Mount Assembly Manual(Download Only) Hard Drives Available Separately Add more storage to your computer by securely installing smaller drives in larger bays. Vibration dampeners reduce noise emittance from traditional platter-based drives. 100% powder-coated aluminum helps dissipate drive heat. Designed for Use in Mac or PC (4) Fine Thread Bracket Mounting Screws for 5.25&#034; PC Bays Hard Drives Available Separately.