Wera 8790 HMA Zyklop Socket Insert 3/8 inch Drive, 1/4 inch External Hex, Matt Chrome 05003520001

Working with external hexagon fasteners in tight spaces often means struggling with bulky sockets or poor visibility. The Wera 8790 HMA socket insert solves this by combining a low-profile design with precision engineering, allowing you to drive 1/4-inch hex screws and bolts confidently, even in confined areas. Its 3/8-inch square drive fits standard ratchets and power tools, while the external hex profile grips fasteners securely to prevent rounding.

Who is it for

This socket insert is ideal for professional mechanics, maintenance technicians, and serious DIYers who need reliable access to external hex fasteners in automotive, industrial, or machinery applications. It is particularly useful where space is limited and a standard socket would be too bulky.

Main features

• Precision-machined external hexagon profile for a snug fit on 1/4-inch (6.3 mm) fasteners
• 3/8-inch square drive compatible with Wera Zyklop ratchets and other standard tools
• Forged from chrome-vanadium steel for high strength and durability
• Matt chrome-plated finish resists corrosion and reduces glare
• Knurled grip ring for easy handling, even with oily fingers
• Ball detent groove ensures secure retention on the drive tool
• Wera 'Take it easy' colour coding for quick size identification
• Compact 35 mm overall length fits into tight spaces

Specifications

• Drive size: 3/8 inch
• Socket size: 1/4 inch (6.3 mm)
• Socket profile: External hexagon (6-point)
• Material: Chrome-vanadium steel
• Finish: Matt chrome-plated
• Overall length: 35 mm
• Outer diameter: 17 mm
• Application: Manual and non-impact machine operation
• Retention mechanism: Ball detent groove
• Corrosion resistance: Yes (chrome plating)

Tips

Always match the socket insert size exactly to the fastener to avoid damage. For best results, use with a Wera Zyklop ratchet to take advantage of the low return angle and secure locking. Keep the insert clean and lightly oiled to maintain smooth operation and prolong its life.