About the Alpine KTX-EBKT Secure your sub A sliding sub box can be a nuisance, and in an accident, a danger. Don't take chances — Alpine's KTX-EBKT mounting brackets will hold down virtually any sub box. These black powder-coated 7 mm steel brackets will work with any enclosure with some drilling. With select Alpine Halo, R-Series, and PrismaLink enclosures you won't even need to drill holes in the box. Warranty: 1 year. Product Highlights: MFR # KTX-EBKT Item # 500KTXEBKT What's in the box: 2 Enclosure mounting brackets Twelve M6x20 screws Eight M6x16 screws Two M5x20 machine screws 2 Lock washers 20 M6 flat washers 4mm Allen key Features Overview: The Alpine KTX-EBKT Universal Mounting Bracket lets you firmly secure select Alpine and non-Alpine subwoofer enclosures (sold separately) to your vehicle floor or trunk. The KTX-EBKT includes 2 heavy-duty, powder-coated steel brackets along with mounting hardware for directly attaching the brackets to select Alpine enclosures without the need for drilling. Additional hardware is provided for installation on other Alpine and non-Alpine enclosures (drilling required). Compatible Alpine Subwoofer Enclosures: PrismaLink Enclosures: No drilling required R-Series Shallow Enclosures: No drilling required with vertical mounting Halo Enclosures: May require drilling Alpine Vehicle-Specific Enclosures: May require drilling