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Amana spiral flush trim compression bit gives you a 7/8 inch diameter cutting profile on a 3-3/4 inch long bit, so you can follow existing edges while trimming taller panels and laminated parts in one pass. The 1/2 inch shank matches common production routers, which helps reduce chatter and gives a more controlled cut in cabinet and fixture work. A spiral geometry works along the cut instead of chopping, which supports smoother trimming on template-guided jobs. The design as a compression bit manages material from both directions along the edge, which supports cleaner results when working on layered or veneered stock. This router bit is part of the Amana Tool line, so it fits directly into workflows already built around Amana profiles and dimensions.
This Amana 7/8 inch x 3-3/4 inch spiral flush trim compression bit with 1/2 inch shank fits routing setups sized for half-inch shank tools, which is common in production and serious shop routers. The 7/8 inch cutting diameter affects how tight a template corner you can follow, so planning jigs around that radius keeps routing passes consistent. With the 3-3/4 inch length available, material height along the pattern can be matched to the bit reach so the bearing and cutting edges stay on the same reference line. The 2-flute configuration interacts with the router speed setting, so users can match feed pace to material and bit size for smoother trimming.
The Amana 7/8 inch x 3-3/4 inch spiral flush trim compression bit with upper and lower ball bearing is set up for flush trimming where a bearing-guided edge is needed both above and below the cut. Upper and lower ball bearings allow the bit to follow a template or workpiece surface from either side, which helps when switching between face-down and face-up routing on cabinets, doors, or panels. The compression-style spiral cutting action works along the edge while the bearings ride the reference surface, which is useful in laminate or veneered assemblies where edge quality is important. Because this tool is categorized as a router bit in the trim bits group, it aligns directly with template routing, pattern work, and edge cleanup tasks commonly handled on router tables or handheld routers.
The spiral flush trim compression design with upper and lower ball bearing guides helps keep passes consistent from part to part, because the bearings control the path while the spiral flutes manage the material along that path. Using a 7/8 inch diameter with 2-flute geometry creates a predictable contact area, which supports repeatable results when multiple identical components are trimmed against the same template. The 3-3/4 inch bit length gives extra reach along panel edges, so tall workpieces can be routed without changing to a different pattern height. The 1/2 inch shank helps stabilize the bit in routers designed for this size, which is useful when repeating the same trim operation across an entire cabinet run or production batch. With the Amana Tool name and 57178 designation, shops can standardize on this exact configuration to keep replacement bits consistent with existing jigs and setups.
The Amana 57178 router bit is a spiral flush trim compression bit, so it is built for bearing-guided trimming along an existing edge or template.
The 7/8 inch diameter sets the cutting width and effective corner radius, which influences how closely you can follow patterns and how much material is removed per pass.
The 1/2 inch shank fits routers designed for half-inch tooling, giving a larger mounting surface that supports smoother operation with this size of trim bit.
The upper and lower ball bearing guides let the bit follow a template or work surface from either side, which adds flexibility in how you orient the workpiece.
The 3-3/4 inch bit length provides reach along taller edges, so thicker panels and cabinet parts can be trimmed while staying on the same reference surface.
The 2-flute design offers two cutting edges in rotation, which balances cutting forces and helps maintain a steady trim along straight or curved profiles.
The Amana 7/8 inch x 3-3/4 inch spiral flush trim compression bit with upper and lower ball bearing and 1/2 inch shank brings together bearing guidance, spiral cutting, and a defined 7/8 inch diameter for template-based trimming. At Wurth Baer Supply, this 2-flute router bit with the 57178 designation fits directly into workflows that rely on consistent dimensions and repeatable passes. Select this Amana Tool trim bit when your cabinet, door, or panel jobs call for a bearing-guided spiral flush trim profile in the sizes listed here.
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