Combat Utilies are a class of items.
Utilities can be swapped or equipped during combat, but doing so costs 50 AP. (25 AP with Quick Pockets)
All offensive throwing utilities such as grenades and throwing knives count as combat utilities rather than weapons. Combat utilities do not have explicit critical stats, but any offensive utility that can critically hit uses the default base values of 5% critical hit chance and 100% critical damage bonus. Other throwable items such as flares also exist.
The stack size of throwing knives is limited to 30, grenades to 10, caltrops to 5.
Crossbow special bolts
These are what makes crossbows versatile; bolts can be made serrated, coated with poisons, rigged with explosives or small electroshock charges and so on.
The stack size of special bolts is limited to 99.
Other items, usually electronic devices, that supplement your combat abilities or ID badges that must be worn.