Wiha 13690 Insulated Inch Hex L-Key 8 Piece Set is a professional insulated hex key set for electricians, industrial maintenance crews, and anyone servicing energized equipment that uses inch-size hex fasteners. This is a hex L-key set designed for fastening and service work in energized applications. Model Number: 13690.

The big reason to buy this set is electrical protection without giving up real tool quality. Every key is individually tested to 10,000 volts AC and rated to 1,000 volts AC or 1,500 volts DC. Wiha also states compliance with ASTM F1505, EN/IEC 60900, and CSA benchmarks, which is what serious users want to see when insulated tools are going into a live-work kit.

Size coverage is practical, not filler. The set includes 1/8 inch, 5/32 inch, 3/16 inch, 7/32 inch, 1/4 inch, 5/16 inch, 3/8 inch, and 1/2 inch hex L-keys. That makes this a strong fit for panel work, industrial electrical service, and equipment maintenance where inch hardware still shows up and larger hex sizes are common.

Wiha backs the insulation with solid tool construction underneath. The keys use vanadium-molybdenum hardened tool steel and have precision machine-chamfered ends. In plain terms, that means cleaner fit in the screw or socket head, easier starts, and less chance of fighting a rough-cut tip that wants to cam out or damage the fastener.

The double-insulated red-over-yellow construction is not just there for looks. It gives a clear visual safety cue if the outer insulation is damaged. The additional soft black grips also make the longer arm easier to hold and control, especially when you are leaning into a stubborn fastener inside cabinets, enclosures, or machinery.

Physically, this is a larger insulated hand tool set with an overall package weight around 2.17 pounds. Tool lengths vary by size, with the long arms ranging from about 4.1 inches up to 9.2 inches and the short arms from 1 inch up to 1.625 inches. That spread gives you compact access on the short side and usable leverage on the long side.

If you are a general DIY user who just needs occasional hex keys, this is more tool than you need. If you are an electrician, controls tech, plant maintenance mechanic, or service professional working around live circuits, the Wiha 13690 Insulated Inch Hex L-Key 8 Piece Set makes a lot more sense. It is built for users who need inch hex sizes, insulated protection, and job-ready fit and finish in the same set.

Wiha 13690 Insulated Inch Hex L-Key 8 Piece Set for serious electrical work

This is the kind of insulated hex key set you buy because the job actually calls for it, not because it looks good in a drawer.

• Who it's for: Electricians, maintenance techs, and service pros working around energized gear that uses inch-size hex fasteners.
• Why it stands out: Real insulated-tool credentials, useful large inch sizes, and the fit and finish Wiha is known for.
• Worth knowing: This is a specialized insulated hand tool set, so it makes the most sense for live-work and electrical service users, not general household use.

• Is this an SAE or metric hex key set? This is an inch-size insulated hex L-key set. Sizes run from 1/8 inch through 1/2 inch.
• What voltage is it rated for? The tools are rated to 1,000 volts AC and 1,500 volts DC, and each tool is individually tested to 10,000 volts AC.
• What standards does it meet? Wiha lists ASTM F1505, EN/IEC 60900, and CSA testing benchmarks for this set.
• Where is it made? This set is made in Germany.