Alvin protractors are constructed of heavy-duty 0.090" transparent laminated PVC plastic with a beveled outer edge for accurate drawing. Each protractor features a center cut-out for convenient finger lift and accurate die-stamped graduations. Available in round, half-round plastic.
General's drafting/drawing protractors are used for setting bevels, measuring, and transferring angles. Durable stainless steel construction. Alvin and General professional drafting protractors.