I don't use the 1/4" shanks. I find that the Dremel tool with the cable allows much better control and allows me to get into places that the larger grinders can't get into. I have air powered die grinders that use the 1/4" shanks but there is almost no control with that tool in your hands. Using 1/8" shanks on carbide burrs, sanding drums and cutting discs in a Dremel I can hold the 3/4" handle in one hand and have excellent control to cut straight lines, gentle radius changes and blend into the existing passages with almost no fatigue. Using the larger tools always wore me out and left me wanting to go back and correct the "racing stripes" from runaway burrs. It takes a bit longer to remove material with the smaller tools but I am doing it for me - no customer to complain about how long it takes.

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Paul
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retired mechanic after 35 years
specialized in Holley carbs and Ford Automatic Transmissions