Title: handy tool!
Product review: I am a professional remodeling contractor and I install tubular skylights and own the 16" model. After some trial and error, I have found that a) you need to use the clutch on your drill to keep the binding action (that is inevitable) from hurting you. b) the blade positions do work well to set the hole size and keep everything centered - you just have to look closely at the markings, then check the total diameter with a tape measure.This tool is built extremely well and does a great job of cutting clean holes in drywall and plaster (haven't tried wood yet).
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