Open-end and box wrench 21 mm Dedra 1455P — hand tool for fastening nuts and bolts

Dedra 1455P is a 21 mm open-end and box combination wrench designed for tightening and loosening nuts and bolts. This hand tool provides a single fixed-size drive that combines an open-end jaw and a boxed ring on the opposite end, enabling access in confined spaces and secure engagement with hexagonal fasteners. The solid construction delivers stable grip and reliable torque transfer for mechanical, automotive and household maintenance tasks.

Advantages

The combination of an open end and a boxed ring in one 21 mm tool reduces the need to switch tools when working on assemblies with limited clearance. Durable metal construction resists bending under normal service loads and maintains the wrench profile for consistent contact with fastener faces. The boxed end offers full perimeter engagement to minimize rounding of nuts and bolts, while the open end allows quick placement and operation on protruding fasteners.

Suitable for

• Automotive repair and servicing where 21 mm fasteners are used
• Mechanical assembly and maintenance tasks on machines and equipment
• Household repairs involving plumbing fixtures, furniture and DIY projects
• Field service work requiring a compact, single-size wrench

Key specifications

• Wrench type: combination (open-end and boxed ring)
• Working size: 21 mm
• Material: hardened steel alloy suitable for hand tools
• Finish: corrosion-resistant surface treatment for extended service life
• Drive orientation: fixed single-size, two-ended configuration

How to use

Select the 21 mm end appropriate for the task: use the boxed ring end for maximum contact and torque when loosening or tightening hexagonal nuts and bolts, and use the open end for fast access to bolts with exposed heads or when working on studs. Position the wrench squarely on the fastener, apply force steadily and avoid sudden impacts. For stubborn fasteners, confirm correct seating of the boxed end before applying additional torque and use controlled leverage to reduce the risk of fastener or tool damage.

Usage recommendations

Inspect the wrench before use for wear, cracks or deformations. Use standard safe-handling practices: wear eye protection when working on pressurized systems, avoid using cheater bars or excessive force, and select the correct 21 mm size to prevent rounding. Clean and store the wrench in a dry place to preserve the corrosion-resistant finish and ensure reliable performance.