Stanley 66-178-A Slotted Screwdriver 3/8 in Square Shank

Product Description

The STANLEY 66-178-A is a standard slotted screwdriver built for professional tradespeople who need a reliable, heavy-duty hand tool for driving flat-head fasteners. The blade measures 3/8 inches wide and 8 inches long, giving it the reach needed for deep-set screws in electrical panels, junction boxes, HVAC equipment cabinets, and plumbing fixture work. A square shank design adds torque capability, allowing a wrench to be applied to the shank when extra turning force is required. The acetate handle provides a firm grip and resists solvents and oils common in trade environments. Overall length is 13.25 inches. Weighing 0.653 pounds, it balances well for extended use on the job.

This screwdriver is suited for residential and light commercial trade applications. Electricians use it for terminal screws, cover plates, and panel work. HVAC technicians reach for it when servicing equipment enclosures, blower compartments, and control box fasteners. Plumbers use it on fixture hardware and access panel hardware. The 8-inch blade length is particularly useful when working inside equipment cabinets or wall cavities where a standard-length screwdriver cannot reach the fastener.

Key Features

• 3/8 inch blade width suits standard slotted fasteners across trade applications
• 8 inch blade length provides reach for deep-set or recessed screws
• Square shank allows wrench engagement for increased torque on stubborn fasteners
• Acetate handle resists solvents, oils, and common shop chemicals
• 13.25 inch overall length balances reach with control
• Standard tip profile compatible with typical flat-head screw slots

Compatibility

Designed as a general-purpose slotted screwdriver for use with standard flat-head fasteners encountered in electrical, HVAC, plumbing, and mechanical trade work.

Installation Notes

Always de-energize electrical equipment and verify zero voltage with a meter before using any screwdriver inside panels or control boxes. When applying a wrench to the square shank for added torque, ensure the blade tip is fully seated in the screw slot to avoid cam-out or fastener damage. Inspect the blade tip before use and replace the tool if the tip is chipped, rounded, or deformed, as a damaged tip can slip and cause injury or fastener damage.