T-Handle Hand Drills assist doctors to perform bone surgeries. Surgeons use them to place wires into bones when they need to treat and repair fractures. In addition, they help drive external fixation pins to attach pieces of bones together.We made the chuck in order to allow easy attachment of K-wires and drill bits. In addition, a chuck keyhole is available so that you can fix the wire or drill bit in place securely. This prevents accidental slips and slides in critical surgeries.