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They all seem to be identical in function (although the linked pattern bit is shorter, so it can't cut as deep of a copy as the others can), so is this just a marketing thing? Rockler's flush trim bit I linked is even listed as a "Pattern flush trim bit".

Also worth mentioning, some flush trim bits have cutting surfaces on the tip of the bit to allow plunging it through a laminate. (These typically have a flat reference surface instead of a bearing.) This is useful if you've laminated over a hole in the substrate that you want to remain open.

The second bit, labeled "pattern" bit, could route along a pattern/template mounted to the top of a workpiece without going all the way thru the workpiece. Using successively deeper passes, this bit would eventually not require the template at all, instead running it's bearing along the surface it just routed. This allows for routing rabbets or dadoes of various depths that must follow a template. The bit's shallow depth allows it to handle thinner material.

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A pattern or template bit has the bearing at the top of the bit (between the shank and the cutting blades.) This is so that it can follow a template attached to the top of a larger workpiece, cutting the workpiece to match the template. I believe that the terms "pattern bit" and "template bit" are interchangeable.

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A flush trim bit has the bearing at the bottom of the bit. This is so that it can trim a layer of laminate (i.e. Formica) that has been attached to the top of a smaller substrate (i.e. MDF or particle board) flush to the substrate.

I see router bits marketed as flush trim bits, pattern bits, template bits, but they all seem to be similar in design. The cutting edges are exactly lined up with a bearing, so that an exact copy of a piece can be cut.

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