Open-end/box wrench Dedra 21 mm model 1455

Combination open-end and box wrench Dedra 21 mm model 1455 is a hand tool designed for tightening and loosening hexagonal nuts and bolts with a 21 mm head. The tool combines an open-end jaw on one side and a full 12-point or 6-point box ring on the other side to provide two working options in a single solid, single-piece construction. It is intended for manual torque application in automotive, bicycle, mechanical and household repair tasks where a reliable grip and compact tool profile are required.

Advantages

The Dedra 21 mm combination wrench offers a durable one-piece design that reduces flex and increases strength during use. The dual-end configuration provides quick access with the open end and improved contact with the box end for turning under higher torque or in confined spaces. Its solid construction delivers consistent grip on fasteners and simple, maintenance-free operation without moving parts.

Suitable for

• Automotive repairs and maintenance (engine components, brake and suspension work)
• Bicycle servicing and adjustments
• General mechanical assembly and disassembly
• Household plumbing and furniture assembly tasks

Key specifications

• Working size: 21 mm across flats suitable for standard hex fasteners
• Combination design: open-end on one side and box ring on the other
• Material and finish: hardened steel construction with protective surface treatment for corrosion resistance
• Single-piece construction for increased strength and durability
• Hand tool for manual torque application; not intended for powered impact tools

How to use

Select the 21 mm end that best fits the fastener and position the wrench squarely on the nut or bolt head to avoid rounding. Use the open end for quick placements and when access is limited; use the box end for better contact and torque distribution when tightening or loosening. Apply steady, controlled force and reposition the wrench as needed to complete rotation in confined spaces. Inspect the tool and fasteners visually before use to ensure correct fit.

Usage recommendations

Use this wrench for manual tightening and loosening only; avoid using it with impact drivers. Match the 21 mm size precisely to the fastener to reduce slip and rounding, and keep the wrench clean and dry to maintain grip and corrosion resistance.