Dremel 4486 MultiPro Keyless Chuck

• Chuck allows quick and easy accessory changes without changing collets
• Accepts accessories with 1/32-inch to 1/8-inch shanks
• For use with Dremel rotary tool models 275, 285, 395, 398
• Also for use with models 750, 770 and 781

It really works and is by far the most valuable accessory for the Dremel. It closes down to near 0 for the smallest of drill bits (much smaller than a sewing needle) yet still holds larger bits than the "large" hex collet. It is well made and durable, withstanding everything from concrete and tile dust to oily metal shavings. It must be tightened with considerable force to resist slipping under heavy use but that's to be expected.

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This chuck (which I consider to be essential) greatly enhances the convenience of any Dremel. You might be tempted to save the old collet device this chuck replaces, but before long you will discard it as useless trash. I do a lot of really miniature work and I find the chuck to be great for holding things as small as a 1/64th inch drill. I have one on each of my 3 Dremels.

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I consider the MultiPro chuck to be the best accessory ever made for the Dremel tool. When you're doing work that requires constant bit changes, the changing of collets to fit a bit of a particular diameter becomes a real frustration, and wastes time. So, needless to say, an adjustable chuck is a real boon for these kinds of jobs. Just loosen it to remove one bit, pop in another, tighten, and vwah-lah! The collet nut and collets become pretty much obsolete.

The chuck may seem somewhat pricey, but when you consider the time you'll save and the convenience you'll enjoy, it's well worth the extra investment.

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An adjustable drill chuck for the Dremel power tool is a brilliant concept. Unfortunately the manufacturing precision is less than brilliant. I purchased the chuck for diamond drilling my wife's quartz crystals and gem stones in a water bath. The chuck jaws are eccentric (out of true) and a 1 mm diamond drill tip actually moves in a noticeably larger circle. This makes it difficult to start the drill in a hard surface and also causes water to be splashed about when drilling. I have owned large drill presses which are much closer to being true than this chuck. It might work OK for softer materials but I don't understand why it couldn't have been manufactured true in the first place.

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This is a really nice idea from Dremel that is supposed to make changing bits a lot faster. And that it does. Plus it is very well made. However, I stopped using it as no matter how hard you tighten it, it loosens up and the bit begins to wobble (not a good thing at 5000 rpm). Then you have to stop and retighten. So it's too much of a bother. I do not recommend this item.