  Parallel Gliders by Alvin Alvin parallel gliders and metric parallel gliders are easy-to-use combining the functions of a t-square, triangle, transparent straightedge and protractor in drafting, drawing and nautical applications. Parallel gliders roll easily to make parallel lines but won’t turn under slight accidental pressure. A great drafting tool the parallel gliders features durable clear acrylic with die-sunk graduations. Ruling edge in inches (reading to 16ths) or in metric. Eluxite satin finish aluminum grip bar and non-slip knurled rollers with non-skid rubber O-rings for smoother operation. Individually packaged with complete instructions.
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