Moutain RM6 Features and Benefits VERSATILE- Extra long, flexible and reversible making it the most versatile ratcheting wrench on the market 90 TOOTH DESIGN- This Mountain product comes with a patented 90 tooth design 180 DEGREES - The 180° rotating head on both ends of the wrench allows the ratchet wrench to flexibly bypass obstacles for easy use at any angle PATENTED DESIGN- Innovative internal gear mechanism and Spherical profile (Spline Plus) makes this one of the best performing ratcheting wrenches available COLLAR- Raised box end gear provides more surface contact and access to recessed Fasteners The Mountain RM6 5-Piece Metric Double Box Universal Spline Reversible Ratcheting Wrench Set is premium quality that comes with a patented 90 tooth design.