Flat wrench Proxxon 16 × 17 mm PR23842, double-ended open spanner

Proxxon flat wrench 16 × 17 mm PR23842 is a compact double-ended open spanner designed for tightening and loosening metric nuts and bolts with 16 mm and 17 mm jaw openings. The slim-profile flat design provides access in confined spaces where bulkier tools cannot reach, making it suitable for precise mechanical work, automotive repairs and general workshop or household maintenance.

Advantages

The double-ended open spanner features two commonly used metric sizes in a single, space-saving tool that reduces the need to switch wrenches. Its flat construction improves accessibility in narrow gaps and between components. Manufactured by Proxxon, the wrench is engineered for stable contact with fasteners and to minimize rounding of edges when used correctly. The simple, durable design requires minimal maintenance and is easy to store in a toolbox or tool roll.

Suitable for

• Automotive repairs where 16 mm and 17 mm fasteners are present
• Workshop maintenance and machinery adjustment
• Household plumbing and assembly tasks in tight spaces
• Hobbyist and model engineering where a slim open-end spanner is needed

Key specifications

• Jaw sizes: 16 mm and 17 mm
• Type: double-ended open spanner (flat wrench)
• Profile: slim/flat for access in confined spaces
• Material: forged steel (surface finish typical for hand tools)
• Hand tool category: manual wrench for metric fasteners

How to use

Select the appropriate end for the fastener size and position the open jaw fully onto the nut or bolt head to ensure maximum contact. Apply steady torque in the intended direction to tighten or loosen the fastener, keeping the wrench aligned with the fastener axis to reduce the risk of slipping. For stubborn fasteners, ensure the fastener and wrench are clean and free of debris before applying increased force. Avoid using the spanner as a hammer or pry bar to prevent tool damage.

Usage recommendations

Use the Proxxon flat wrench on properly sized 16 mm or 17 mm nuts and bolts, maintain a secure grip and apply controlled torque. Store the tool in a dry place and wipe clean after use to preserve finish and function; do not use with excessive impact or leverage beyond hand force.