Head diameter is just 10mm so you can get really close to an angle without catching. The only thing that gets closer is a long bit, but they work out very expensive compared to using standard length bits.
Ideal for getting between joists to mount speedy hangers"
"the extension bit is ideal for long range driving, especially for hard to reach places where your average battery driver bit won't reach,just connect the extension bit, and the job is made a lot easier. very efficient and good value for money. i would highly recommend this product to you."
"Bought two of these, and used them in my 18v drill driver. They both failed in the same way. I set the driver to the second-highest torque setting. The bit holder and shaft parted company, before the drill clutch even kicked in !! Very poorly made. Might be ok for a bit of light duty screwing, but don't try using for any serious action. (NB I had the same problem with the shorter version of this tool, too) PS.. Screwfix refunded my purchases, no problems. PPS.. The magnet will hold the screwdriver bit, but don't think for a minute that it will be strong enough to have any effect on a screw."
"This bit holder is not cheap so I thought it would be a good one...... I was wrong! The sleeve that holds the bit is out of true and the bit wobbles also the magnet that holds the bit in place is weak and the bit constantly falls out."