| 摘要 |
A socket head having a cylindrical external configuration with an upper end and a lower end and with a cavity on the upper end adapted to receive the end of a turning tool. The lower end of the socket head is fabricated with a frustum shaped cavity. The frustum shaped cavity has an interior surface formed with a plurality of inverted L-shaped projections that are at angles from its main axis. Each inverted L-shaped projection is in a helix pattern twisting down into the tool. The radius of the angles is smaller toward the interior of the tool, creating a contact surface for a variety of fastener sizes.
|
