... wider angle is good for sharpening: scissors, shears, loppers, serrated Knives, etc. The straight angle is good for: skis, snowboards and ... . Simply flip it over and reassemble.GREAT FOR SHARPENING: KNIVES, SCISSORS, SERRATED KNIVES, PRUNERS, AXES, LOPPERS, SKIS, SNOWBOARDS, LAWN MOWER BLADES, HEDGE ...