Combination wrench YATO YT-0391, 21 mm and 23 mm, Cr-V stainless finish

YATO YT-0391 is a single-piece combination wrench with two working ends sized 21 mm and 23 mm. Manufactured from chromium-vanadium (Cr-V) steel with a stainless-style finish, the tool is designed for applying torque to hexagonal nuts and bolts while resisting wear. With a compact overall width of 34.4 mm and a one-piece construction, this double-size wrench suits tight spaces where carrying multiple wrenches is impractical.

Advantages

The single-piece Cr-V construction provides consistent strength and reliable torque transmission across both sizes without the weakness of joints or seams. The stainless-style finish improves corrosion resistance and simplifies cleaning after use. Combining two common metric sizes in one tool reduces the number of separate wrenches required and saves space in toolkits. The slim profile helps access fasteners in narrow or confined areas.

Suitable for

• Tightening and loosening nuts and bolts in automotive maintenance and repair
• Plumbing connections and fittings where 21 mm or 23 mm fasteners are used
• General mechanical and maintenance tasks in workshops and industrial settings
• Field service and mobile toolkits where space and weight are limited

Key specifications

• Working sizes: 21 mm and 23 mm
• Material: chromium-vanadium (Cr-V) steel
• Finish: stainless-style surface treatment for improved corrosion resistance
• Construction: single-piece combination wrench
• Overall width: 34.4 mm

How to use

Select the appropriate end of the combination wrench (21 mm or 23 mm) to match the fastener size. Position the open end or box end squarely on the nut or bolt head to ensure full contact with the flats, then apply steady force in the intended direction to tighten or loosen. Use controlled force to avoid rounding fastener corners and inspect the wrench for wear before high-torque applications. For stubborn or seized fasteners, apply penetrating lubricant and allow time to work before applying torque.

Usage recommendations

Use the wrench within recommended torque limits for the fastener material, avoid using cheater bars or extensions that can overload the tool, and store the wrench in a dry place to maintain the stainless-style finish. Regularly inspect the contact surfaces for deformation and replace the tool if excessive wear or damage is detected.