๐ A double-bearing flush trim bit (with bearings on both ends) is handy because itโs like having two bits in one. Youโd use it when you might need to flip your workpiece or change bearing reference without changing bits. For example, imagine routing a complex shape where grain direction changes โ you might start with the template on top and trim part of it, then to avoid tear-out in another section, flip the piece and use the other bearing. The double-bearing bit lets you do that easily. Also, if you have a thick workpiece that a single-bearing bit canโt fully trim in one go, you can rough-trim with the first bearing, then invert and finish with the second bearing from the other side. Essentially, it provides maximum flexibility and can follow a template from either side. Many pattern-routing jobs (like guitar bodies or furniture parts) are made easier by not worrying which side the template is on โ a dual-bearing bit always finds it.
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