Wiha 33478 T-handle Hex Key Set 4-10mm 5 Piece

Product Description

The WIHA 33478 is a 5-piece T-handle hex key set designed for high-torque fastening applications in electrical, mechanical, and light fabrication work. Each key features a cushion grip T-handle that allows technicians to apply firm, controlled torque without fatiguing the hand. The keys are manufactured from chrome vanadium molybdenum steel, which provides hardness and resistance to wear over repeated use. The set covers metric hex sizes from 4 millimeters to 10 millimeters, making it suitable for a broad range of fastener sizes commonly encountered in panel work, equipment assembly, and service tasks. The set weighs 1.44 pounds.

This set is suited for electricians, HVAC technicians, and mechanical service professionals who regularly work with metric hex fasteners. The T-handle design is especially useful in tight spaces where a standard L-key provides insufficient grip or torque. Typical applications include tightening set screws on motor mounts, electrical enclosure hardware, and equipment access panels. The 5-piece configuration covers the most commonly used metric hex sizes in trade service work.

Key Features

• Chrome vanadium molybdenum steel construction for durability and wear resistance
• Cushion grip T-handle provides comfortable, high-torque control
• Covers metric hex sizes 4.0, 5.0, 6.0, 8.0, and 10.0 millimeters
• 5-piece set addresses the most common metric hex fastener sizes in trade applications
• T-handle format allows greater torque input compared to standard L-style hex keys

Compatibility

Designed for use with metric hex fasteners in the 4 to 10 millimeter range across electrical, HVAC, plumbing, and mechanical service applications.

Installation Notes

These hex keys are intended for use by qualified trade professionals working on equipment with metric hex-drive fasteners. Always confirm fastener size before applying torque to avoid rounding the socket. De-energize and lock out electrical equipment before using hand tools inside enclosures, per NFPA 70E guidelines. Store the set in a dry location to prevent corrosion of the steel keys.