Specification: Type: Hard Disk Shock Absorber Bracket Model: 3.5" to 5.25" Material: Metal Bracket + Rubber Nails Color: Black Size: 145x123x30mm Metal Structural Support: Made of black metal, one piece stamping forming with precision mold, special processed surface, scratch resistance, difficult deformation faded. Function: Mount 3.5 inch Hard disk into a standard 5.25 inch front DVD ROM bay position, Avoid hard drive in the traditional installation and chassis rigid contact. Suspension Design: Hanging flexible installation, reduce the hard disk in high-speed work with the chassis resonance noise. Rubber Stand: Protect the hard drive from receiving external shocks without mechanical damage for shock reduction. Use: Suitable for most chassis with optical drive, and one bracket occupies one optical drive. Fits in any 5.25 inch front bay. Easy to Install: Come with complete spare parts, HDD mounting bracket, fixed iron, shock-absorbing rubber nail, mounting screws. Package List: 1x Hard Disk Shock Absorber Bracket 6x Rubber Nail 2x Fixed Metal Strip 8x Mounting Screws