My set includes 4 slotted screwdrivers, PH1 and PH2. These screwdrivers are designed to be the toughest screwdrivers on the market. They have a striking plate at the top of the handle for hammering on the screwdriver, either to pry tiles off walls, chisel into bricks for fun, or try to get out screws that have seized up. The smallest slotted screwdriver doesn't have a striking plate.
They also feature a hexagonal grip at the bottom of the handle, designed for spanners. This allows you to grip the screwdriver with a spanner to apply more torque for heavy duty applications.
These screwdrivers are thru-tangs, so the screwdriver blade extends all the way through the handle, for added strength. Cheaper screwdrivers commonly don't extend through the handle, so can snap off at the bottom. This is very important, especially if you're using these to pry things apart.
At their tool shows, they demonstrate them chiseling stone to dust with these, and they hold their shape. I haven't tried this, but I don't doubt it to be true. You can chisel stones and bricks, and keep using them to drive screws. You can get a set with PZ 1&2 instead of PH 1&2. I went with the PH set because if needed, I could use them with PZ screws without damaging them, but hammering PZ screwdrivers into PH screws is likely to cause damage. They also do a newer version now with a socket hole in the striking plate with space for a 1/4" ratchet, another way of applying extra torque.
I don't generally like buying 'proper' screwdrivers, by 'proper' I mean screwdrivers that are fixed, without changeable bits. You use them, they take up too much space, they wear out, you bin them. I much prefer using a set of bits and a handle with some sort of bit holder. These are different though, and I think these are pretty much the only 'proper' screwdrivers I own. All the others just wore out, might have one or two others somewhere, but I don't use them. Since these will last, I thought it was a worthwhile investment, something my handle and bits can't do. I love these screwdrivers, although I only actually use two of them. I use the biggest slotted one mainly just for chiseling and prying, and the PH2 for general screwdriving. Might be better off just buying one or two separately.
In terms of using them to loosen seized up screws, I always go straight for the impact driver to be honest, gets the job done easily. For me, these are mainly just for chiseling and prying. They are great screwdrivers though, and probably are the toughest ones you will find. These go for about £20 for a set of 6, and if you want to own one set of screwdrivers, these are what you're looking for.
Tech specs:
Officially part of the Kraftform Plus 900 Series of screwdrivers.
SL 1.2x7x125mm
SL 1x5.5x100mm
SL 0.8x4.5x90mm
SL 0.6x3.5mm
PH1x80mm
PH2x100mm
The sets also come with a plastic rack, which you can hang up and use to store the screwdrivers, if you want.
