The Crescent X6™ Ratcheting Metric Spanners have a 5° ratcheting arc that provides greater access to fasteners. With innovative stepped box ends for easy access and clearance. The smooth profile allows for more torque to be comfortably applied to the fastener. They fit 6 fastener types: Hex, Square, 12 Pt., E-Torx®, Rounded Hex, and Spline. Each spanner covers 4 sizes: 8, 10, 12 and 13mm on one and 14, 15, 17 and 19mm on the other, a total of 8 sizes in just 2 spanner.