The Dremel brand cut off wheels with the circular ventilation holes are the best cutoff wheels I've used yet. Everything else is sub par for stone work though.

I'm sure there's a "right tool for every job", and that applies to Dremel as well. Myself, I have pretty bad arthritis, and the extra weight and tug of a cord just wears out my hands, and wrists all the faster. I've been using the model 8100 cordless for the last 2 years, and it's been great. It takes about 20 minutes to charge a battery, and it lasts about 1 hour and 45 minutes when working hard on tough material. On less durable material, and polishing, the battery lasts over 2 hours. I love it. If and when it dies, I'll replace it with another.

Gday, and aloha! This is Red Eye Stones from YouTube. Finally got around to checking in to this forum, and more of your site. Cool stuff, braddah! Chee! I've cut about 20 white from coober pedy, 3 mintabie black, 1 tiny lightning ridge black, and a handful of boulder pieces over the last two years. It's been a very cool journey. Love being the first living being to see what's hiding below the sandstone.