Top quality, carefully ground, with color coded heads, hole through body so you can insert another screwdriver or a rod to apply more force. Many small camera screws nowadays are fixed in place with cement such as Loctite. Top quality, carefully ground flat blades, craftsman grade. Strong fixed blades may be resharpened many times with a grindstone if worn or chipped. I prefer them to the detachable blade drivers sold at higher prices.
Some care is needed in use of the smaller screwdrivers to avoid damage.
Both the flat blade andthe Phillips drivers must fit the slot exactly. I prefer fixed blade screwdrivers personally. The flat ones may be ground to fit specific screws. If damaged, new surfaces may be ground in with a hand grindstone. They can be repointed many times before they become too short.