What is the red 'unlock' handle for, and is it removable or movable or what?

It is used as a grip for the head. It locks in multiple positions (from parallel to drive shaft to 90*) and can rotate from one side of the driver to the other. Turning that handle locks it in whatever position you find comfortable for the task at hand. It is not removable but if you lock it parallel to the drive shaft its like its not there. Its a great feature.

Why does this one cost so much more than De Walt, Milescraft and others? It seems to be pretty simple looking compared to the rest.

I think it is a matter of quality. The Milwaukee, the one I now own, is beautifully made of solid castings, high-quality gears, and a nice hex chuck with a pull-to-realease brass ring. The only organic (plastic) part I can find is the cover on the adjustable handle and the grease on the gears. The gears are tight with only about 3 degrees of lash.The Milescraft has a plastic handle with a simple hex magnetic chuck, not a positive locking chuck line the Milwaukee. The Dewalt DWARA100 has a larger case and places the tip of a standard #2 Phillips bit very close to the chuck obstructing view, while the Milwaukee provides a nice view of the bit-to-screw-head connection.Also the neither the Milescraft or the Dewalt show a handle to manage the significant torque of exerted by a right-angle attachment. I am not sure I would like to use one of these without this handle.Ultimately, the parts that really matter are the two gears and the bearings. These are not visible and I can only inspect the ones on my Milwaukee, which are excellent. The Dewalt claims a 5 times longer life than the "competition", so I assume this means they have good gears. My experience with a cheap model (no longer available) is that gears really matter.ou might want to read my review of the Milwaukee.

What is the distance from the center of the drillbit to the edge of the adapter? Basically how close to a corner can I drill a hole?

The distance from the center of the bit to the front or either side of the adapter is 0.51 inch, or a tiny bit more than half an inch. So you can drill a hole that is half an inch from both sides of a corner.

How do you rotate the handle about the shaft? (Not lift and lower) Mine seems to be stuck in one position.

To rotate the handle around the shaft you need to lift the handle up by unscrewing it to 120 degrees then rotate.. This keeps it from rotating on accident

Brand	Milwaukee
Voltage	110
Amperage	18 Amps
Colour	Multicolour
Included Components	Unit^Instruction Guide
Speed	100 RPM
Maximum Power	800 Watts
Is Electric	Yes
UPC	045242183524 758710430180 740528466109 044904498365 018717217369 826659234838 602458863055 758353222821
Global Trade Identification Number	00045242183524
Manufacturer	MILWAUKEE ELECTRIC TOOL
Item model number	49-22-8510
Product Dimensions	25.4 x 5.08 x 15.24 cm; 472 g
ASIN	B000BYEJ02

Milwaukee 49-22-8510 Right Angle Drill Attachment Kit

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