Stanley Proto ratcheting spline combination wrenches allow the user 13 degrees additional swing. Features polished chrome, reversible ratcheting and an open-end configuration. The set includes 38 fractional and metric sizes as well as four wrench sets. The wrench pattern features a patented I-beam design that removes material weight while offering an increased bearing surface to help improve comfort and reduce hand fatigue. Comes with an anti-slip design, locking the wrench onto the fastener head to prevent wrench slippage. Can be used on spline, 4-point, 6-point, 12-point and Torx fasteners. Fractional sizes range from 1/4” to 1 1/4” and metric sizes from 6mm to 32mm.