Tribus Tools is a rugged ratchet wrench for O2 and NOx sensors. With its flexible head design and patented tapered nut ratchet technology, it can handle even the most complex sensors. Has a 4° range of motion: each click equals 4 degrees, and the ability to rotate 360° allows access to hard-to-reach areas. It has a larger surface area, giving a stronger torque position than a standard ratchet wrench. The ratcheting cap nut technology prevents rounding and deterioration of fasteners.