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6K399-L inner corner black is a plastic corner piece from Schwinn Hardware that connects aluminum L-channels at an inside corner. It creates a finished transition where two channel lengths meet, which keeps decorative channel runs visually continuous across cabinet or furniture edges. The 13/16 inch width supports use with channels sized for that dimension, which helps align the corner piece with the channel profile for a consistent look along the installation. The black color matches black aluminum L-channels, so the joint blends into dark channel runs instead of drawing attention at direction changes. Because it is designed as an inner corner, it addresses inside 90-degree turns where channels return along another surface, which is common in cabinet, shelving, or display layouts that wrap an interior corner.
This plastic corner piece is designed so that a straight cut can be made to each aluminum L-channel, then both channel lengths are fitted into the corner body. That approach removes the need for a miter cut at inside corners, which simplifies cutting steps and reduces layout checks at every turn. The 13/16 inch width helps the installer match the channel selection to the corner piece, so the faces align and the transition line stays even. The black color lets the installer carry a single dark tone through corner and straight sections, which keeps handle or trim runs visually unified across cabinets or casework.
This INNER CORNER FOR ALU L-CHANNELS,BLACK is intended for connections at inner corners along aluminum L-channels. In decorative hardware and moldings applications, that inner corner role fits handle or pull channels that wrap inside cabinet or furniture corners without needing angled cuts. The plastic material supports use in typical interior woodworking environments around cabinets and displays, where aluminum channels are installed as part of a decorative or functional hardware system. Because the web description specifies that plastic corner pieces allow inner or outer corners, this inner corner part works within layouts that also use matching outer corner pieces in the same Schwinn Hardware system to continue channels around a space.
The design that accepts two channel lengths after a straight cut eliminates miter cuts at the junction, which can reduce cutting time and limit the chance of gaps at the corner. Straight cuts are easier to repeat across multiple channel sections, so long runs with several inner corners can be processed with the same cutting setup. Matching the 13/16 inch width to the channel helps maintain a flush surface where the channel and corner meet, which is important when the channel functions as a handle or visible trim along doors or drawer fronts. The black finish gives the installer a defined choice when the surrounding trim or channel hardware is black, which keeps the intersection visually consistent with the rest of the decorative hardware and moldings. As part of a system also provided in silver, nickel color, and dark bronze, this black option fits projects that need a dark accent within the same Schwinn Hardware channel family.
The 6K399-L inner corner is a plastic corner piece for aluminum L-channels that joins two channel lengths at an inside corner, creating a finished transition without miter cuts.
The plastic corner pieces let the installer make a straight cut to each channel, then fit both into the corner piece, so inner or outer corners do not require angled cutting.
The 13/16 inch width indicates the size the corner piece is designed around, helping match it with aluminum L-channels so the channel face and corner line up.
The INNER CORNER FOR ALU L-CHANNELS,BLACK is used in decorative hardware and moldings layouts where aluminum L-channels turn at an inside corner on cabinets or furniture.
The black finish lets the inner corner visually match black aluminum L-channels, keeping the color continuous so the corner joint blends into dark channel runs.
This Schwinn plastic inner corner forms inside 90-degree turns within a channel system, helping maintain a straight, finished look around interior cabinet or display corners.
The 6K399-L inner corner, black 13/16 inch width, plastic fitting from Schwinn Hardware is built for aluminum L-channel inner corner joints where straight-cut processing and a black finish are required. Using this INNER CORNER FOR ALU L-CHANNELS,BLACK with channels sized to its width supports clean transitions along decorative hardware and moldings. For cabinet, furniture, or display runs that rely on continuous black channel lines, this plastic corner piece provides the defined inner corner element within the Schwinn Hardware channel family.