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• Old spiral drivers could be used both as screwdrivers, and more successfully as drills. They lack the direction switch of newer designs, so you have to lift them off the work or reduce the pressure to reset them for the next stroke.

• Enclosed Bone Brace Drill

• Both enclosed and open-frame eggbeater drills are available in polished stainless steel, for all your surgical drilling needs.

• People think of bow drills mainly as the hard-mode way of starting a fire, but they were also used to drill holes. It’s not much easier than starting a fire with one.

• This two-speed eggbeater drill has a clutch that lets you engage either the inner or the outer ring on the large gear, depending on how much speed you want. The flat plate on top is for leaning into for more pressure.

• This exotic variation on a bit brace lets you drill holes up against a wall or in a corner. Ordinary bit braces require clearance on all sides for the handle to turn.

• Brace Drill

• Eggbeater drill

• The oldest brace drills were made of wood.

• Even a simple eggbeater drill can spin much faster than a brace drill.

• Enclosed Eggbeater Drill

• Brace Drill

• Brace Drill

• Brace Drill

• The longer the handle, the more force you can apply to the turning of the bit, at the expense of more arm movement.

• Brace Drill

• Bit Brace

• More “Modern” brace drills are metal and often include a ratchet mechanism, which makes them more convenient to use if you can’t turn the handle all the way around (because something is in the way).

• This is just an eggbeater drill with the gears enclosed.

• Brace Drill

• Brace Drill

• Off-brand Yankee-style drill.

• Two-speed eggbeater drill.

Do you have a better example of this kind of tool? Let me know by leaving a comment, and include a picture of it if you can so everyone can see!