How far do the bits extend out from the Precision Screwdriver?
I happen to have an LTT Precision kit, (access to) an iFixit Essential kit, and a set of calipers.
The LTT bits are 28mm long end-to-end, and the driver's bit socket is 8mm deep, leaving 20mm of bit exposed from tip to socket. For the extremely skinny bits, where the shank is less than 4mm in diameter, the tapered transition between the shank and 4mm hex part protrudes from the socket by 3mm (so you can reach bits about 17mm deep in screw holes).
The iFixit Essential's bits are also 28mm long end-to-end, but their bit socket is 13mm deep. This leaves 15mm of bit exposed. The skinny parts are also shorter because the 4mm hex part has to be longer. For example, the iFixit #000 Phillips is 13mm from tip to taper, while the LTT's #000 is about 17mm.
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