Crowfoot wrenches are ultra-compact open-end wrenches made to fit into tight spaces where other tools can't reach. Use with a torque wrench to tighten fittings and fasteners to specifications. Use extensions to access fasteners or fittings in confined areas. Use various styles of ratchets to increase your reach or angle of access. We optimized our crowfoot wrenches for both access and strength by using steel only where it matters and eliminating the excess. The size is marked on the front of each crowfoot wrench for easy identification. The item number is also provided on the back of each crowfoot wrench.