Perfect for engineering and construction applications. Every Mayline parallel ruling straightedge begins with a durable black phenolic laminate base where we inset a transparent blade for see-through registration and fine line quality. For those who work with a variety of surfaces we designed a straightedge with retractile ball-bearing rollers of metal or Delrin built right into its base. They literally float over any surface whether its paper or film. The rollers come in chrome-plated brass or plastic. We recommend the plastic rollers for use with drafting films. Above-board mounting hardware included.
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