Wiha 66991 13 Piece L Key Hex Key Set 0.050 to 3/8 Inch

Product Description

The WIHA 66991 is a 13-piece L-key hex key set covering a hex size range from 0.050 to 3/8 inches. Each key is manufactured from steel and features a ball end for angled fastener access, allowing engagement at off-axis positions where a straight drive is not practical. The set suits technicians and tradespeople who regularly drive hex socket fasteners across HVAC equipment panels, electrical enclosures, plumbing fixtures, and general mechanical assemblies. At 1.14 pounds, the full set is compact and portable enough for a tool bag or service van tray.

This set is suited for residential and light commercial service work where a wide range of hex fastener sizes must be addressed in a single kit. The 13-key range from 0.050 to 3/8 inches covers both fine instrument-scale fasteners and larger structural hex heads common in equipment mounting and access panel hardware. Electricians, HVAC technicians, plumbers, and general service mechanics will find the coverage of this set useful for routine service calls.

Key Features

• 13-piece set covers hex sizes from 0.050 to 3/8 inches in a single kit
• Ball end design allows fastener engagement at off-axis angles
• Steel construction for durability under standard service torque loads
• L-key form factor provides both short-arm and long-arm drive positions
• Lightweight at 1.14 pounds for easy transport in a tool bag or pouch

Compatibility

Designed for use with standard inch-series hex socket fasteners ranging from 0.050 to 3/8 inches, suitable for general mechanical, HVAC, electrical, and plumbing service applications.

Installation Notes

L-key hex sets are a hand tool and require no installation. Before servicing equipment, de-energize electrical systems per NFPA 70E lockout/tagout procedures and shut off relevant fluid or gas supplies as required by the application. Use the short arm of the L-key for higher torque and the long arm for faster rotation in low-torque situations. The ball end is not intended for primary high-torque driving; use the straight end for final tightening.