These screwdrivers are made to fit specific screws on our tools. They may be useful for other jobs as well. Modeled after gunsmith's screwdrivers with machined tips, correctly sized to fit the screw slots, giving you good power and control, without slipping. Blades are hardened 416 Stainless Steel, except for the Split Nut Driver, which is 4140 Tool Steel. Brass ferrules are numbered. Curly Maple handles.