Flat-Box Slimline Wrench 18 mm Proxxon PR23918, slim profile open-end/box combination

The Proxxon PR23918 Flat-Box Slimline Wrench 18 mm is a slim-profile combination spanner designed for fastening and loosening tasks in confined spaces. It combines an open-end jaw and a box (ring) end in a single 18 mm tool to deliver secure contact with nuts and bolts while reducing the clearance needed around fasteners. The low-profile head and narrow shaft make it suitable for precision mechanical work, maintenance, assembly and situations where access is limited.

Advantages

The slim design provides improved access in tight locations compared with standard wrenches, while the box end offers full perimeter contact to reduce rounding of fastener edges. The combination of open-end and box end allows quick repositioning and versatile use without changing tools. Constructed to Proxxon quality, the tool balances strength and compactness for repeatable torque application in light to medium-duty tasks.

Suitable for

• Precision mechanical and engineering work
• Maintenance and repair of machinery and equipment
• Assembly tasks in confined or recessed areas
• Automotive and bicycle repairs where clearance is limited
• Hobbyist and model engineering applications requiring compact tools

Key specifications

• Wrench type: combination (open-end and box/ring)
• Size: 18 mm working size
• Profile: slim/low-profile head and narrow shaft for reduced clearance
• Material and finish: hardened steel with corrosion-resistant surface treatment suitable for workshop use
• Drive/contact: box end provides full perimeter contact, open end for quick engagement
• Use class: designed for light to medium-duty fastening and loosening

How to use

Select the 18 mm end that best fits the fastener and position the wrench squarely on the nut or bolt head. Use the box end for maximum contact and reduced risk of rounding; use the open end for quicker engagement and when side clearance prevents ring-end use. Apply steady force in the required direction, avoiding sudden impacts. Reposition the open end as needed to progress in tight spaces. After use, wipe clean and store the wrench to prevent corrosion and maintain edge geometry.

Usage recommendations

Use the box end for higher-quality contact and when avoiding damage to fasteners. Do not use the slimline wrench as a hammer or lever beyond its intended torque range. For stubborn or high-torque fasteners, use appropriate torque tools or larger wrenches. Regularly inspect the working faces for wear and replace the tool if deformation or excessive rounding appears.