Wiha 66920 Hex Key L-handle 4mm Ball End Long Arm

Product Description

The WIHA 66920 is an L-handle hex key with a 4mm hex size and a ball end tip, designed for fastening and loosening hex socket fasteners in tight or angled access situations. The long arm measures 138 millimeters in blade length with an overall length of 4-3/4 inches, giving the technician added torque leverage on the short side and extended reach on the long side. The ball end allows engagement at off-axis angles, reducing repositioning time in confined areas. This tool is a standard hand tool used by HVAC technicians, electricians, plumbers, and general mechanical tradespeople working on equipment panels, set screws, and mechanical assemblies.

This hex key is suited for residential and light commercial service work where 4mm hex fasteners are common, including blower assembly set screws, motor mounting hardware, and control panel components. The gray L-handle body and long arm configuration make it practical for both open bench work and in-unit service calls. It ships as a single unit and is appropriate as a replacement or addition to a standard field tool kit.

Key Features

• Ball end tip allows fastener engagement at off-axis angles for access in confined spaces
• Long arm style at 138 mm blade length provides increased torque leverage
• 4mm hex size fits standard metric hex socket fasteners
• L-handle design for two-grip positions: speed on the long side, torque on the short side
• Overall length of 4-3/4 inches with 0.5 inch overall width
• Gray handle for visual identification in multi-key sets

Compatibility

Designed for use with 4mm metric hex socket fasteners. Compatible with any application requiring a standard L-handle ball-end hex key in 4mm size.

Installation Notes

This tool requires no installation and is ready for immediate use. When using the ball end for angled engagement, apply steady controlled force to avoid stripping the fastener head. For high-torque applications, use the short arm for driving to maximize mechanical advantage. Inspect the ball end periodically for wear, as a worn tip can round fastener sockets.