Open Ended Wrench Spanner Metric 5.5mm-46mm Double End Hand Tool Carbon Steel

Measure across the flat faces of the bolt head or nut — this is the wrench size you need. For example, an M10 bolt typically uses a 17mm wrench, while an M8 bolt typically uses a 13mm wrench. If you are unsure, a set of calipers or a bolt gauge will give you an accurate reading before you select your size.

An open-end wrench has a U-shaped jaw that slides onto a fastener from the side, making it useful in tight spaces where you cannot drop a tool straight down. A box-end wrench fully encircles the fastener head, providing more contact points and reducing the chance of slipping under high torque. This wrench uses an open-end profile on both ends.

Carbon steel is widely used in hand tools for automotive and mechanical applications. It provides sufficient tensile strength for the torque levels applied by hand tools on standard metric fasteners. For extremely high-torque applications (such as impact wrench use), an impact-rated socket set would be more appropriate — open-end wrenches are designed for hand torque only.

Yes. Open-end wrenches fit any standard hex-profile fastener — bolts, nuts, and hex-head fittings — as long as the jaw opening matches the across-flats measurement of the fastener. Select the size that corresponds to your fastener's flat-to-flat dimension.

Carbon steel wrenches can handle corroded fasteners, but heavily rusted bolts may require penetrating oil applied before attempting to loosen them. Forcing a wrench on a severely corroded fastener without lubrication increases the risk of rounding the bolt head. Apply penetrating fluid, allow it to soak, then use the wrench with steady, controlled force.

Each wrench in this range is a double-end tool — one end fits the smaller size and the opposite end fits the larger size listed. For example, a "10mm – 12mm" wrench has a 10mm jaw on one end and a 12mm jaw on the other, giving you two sizes in a single tool.

The 2-piece pack gives you a duplicate of the same size wrench. This is useful when you need to hold one fastener in place (e.g., a nut) while turning another (e.g., a bolt) simultaneously — a common requirement when tightening or loosening a bolt-and-nut assembly without a vise.