The Holmenkol Ergo Semi is fantastic value and the easiest way to sharpen your side edge. Fixed at 89 Degrees (1 Degree) and comes with the Cross Mini File HM20521.
The optimum starting tool for edge tuning, the Edge Trick is a pocket-sized device with oxide stone to remove rigidification and burrs on ski edges. Features an angle adjuster in steps of 0.5 degrees from 85 to 90 degrees.