If you close your hand loosely and look down the hole in the middle, it won't take you long to work out why the Narex professional screwdriver range have triangular handles.
These unpretentious tools are thoughtfully designed and built to last. The handles are made of beech wood, stained black so that they don't show the dirt. The shafts are ground from hexagonal bar, with a hexagonal bolster left so that you can get a spanner on them. The hardened shaft then continues right through the handle, so that they can be encouraged onto rusty or painted heads if necessary.
Good quality chrome plating on the shaft, high friction black grippy stuff on the tip, and that's it. A no-nonsense, good quality screwdriver that works for a living.