specialized tools.. they all are such in right hands.
but i do have some specilized tools in use.. like an scalpel blade/x-acto style hobby blades in my survival kit. (with the blade holder and about an inch of the handle which is hollow.. i can put a twig or something inside it if i need longer handle and just duct tape it tight.)
and a stanley/boxcutter blade too. very thin and sharp and lightweight cutter. (tried to carry razor blade but found it way too brittle for me to use) am looking for a ligthweight sheath/handle for it. used to have one out of thin plastic but first it broke and then i lost it.
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knife in my mind needs to be normal type (non folding).. the folding one can be backup/food prep knife. but the user knife needs to be easy to sharpen, even against a rock if needed. any folding mechanism might break and its very hard to fix it "in the wild".. almost impossible to make a makeshift handle in a pocket knife.. but if your basic fixed blade knife breaks its handle you can make a new one rather easily and if the blade breaks in two you can still use the stump somehow.
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when i was trying to find some parts ultra light and small.. and i was able to find a very small diamond sharpener in fishing section. (it has a fish hook sharpening groove too) i think this is the kind:
http://www.cuchillosnavajas.com/en/4054-mini-diamond-stone-sharpener-8435119779639.html#
fishing and boating section is also where i go look for my stainless gate clips etc.
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duct tape i have in several different type of setups.. i carry a small roll if i can but on top of that,
one way is wrapped around an old credit card. (this could actually be useful if it would be operational bank account with little emergency fund in it.) cant use it before unwrapping it. hahah.
second one is wound around my signal mirror. the narrow width duct tape is wound in one end and can be used as "handle" of sorts and half of the mirror is visible as is. can be used as normal small mirror without unwrapping it.
third way: and i have one pencil (carpenter style ie thick) that has a section of ducttape rolled around, another section has rubberbands wrung around it, the rubber bands hold couple sowing needles, and then there is some sowing thread wound around it too.
....new idea i saw while ago: next time when i have used the credit card duct tape, i will find piece of reflecting tape of bright color or just silver, tape that on side of the credit card and then put a fresnel lense with it (a thing plastic magnifying lense), drill a lanyard hole into them and then i will take a piece of waxpaper and wrap that around those two. and then wrap the duct tape around it. that way i can slide the lense or the reflector card out of the duct tape easier to use them without unwrapping the tape.