Roller-Guided: built-in rollers maintain consistent contact pressure along the edge during sharpening Adjustable Side Edge: set the bevel angle to match your ski's geometry for precise sharpening Phantom Guide System: clamp holds files and diamond stones at the selected angle along the full edge Compact: 7 x 4 x 2 inches - fits in a tuning kit alongside files, stones, and other edge tools From : Scandinavian tuning tools developed through decades of World Cup support since 1946