6-12 mm Flat Tip Power Bit

When a slotted fastener will not budge under normal hand pressure, an impact driver delivers a sharp rotational blow that breaks the static friction without rounding the slot. This 12 mm insert is shaped and sized to handle that shock load, giving you a reliable connection between the tool and the fastener.

The 5/16 inch hex shank seats securely in manual impact drivers and compatible powered units. Because the shank diameter is shared across all four available widths — 6 mm, 8 mm, 10 mm, and 12 mm — you can switch between sizes in seconds without swapping holders or adapters.

Sold individually, this insert lets you stock only the widths your work actually demands. Replace a single worn piece from an existing collection, or assemble a purpose-built selection of the sizes you reach for most often. Mechanic tools work hardest when every piece in the drawer earns its space, and buying singles means nothing sits unused.

Whether you are servicing heavy equipment, working on vintage machinery with slotted-head bolts, or loosening corroded electrical-panel screws, the 12 mm width gives you the precise fit the fastener was designed for. Pair it with a quality manual impact driver and a hammer, or drop it into a powered unit for repetitive tasks.