Machined from clear acrylic. Metric measuring scales and alignment grids are engraved on the underside, which eliminates any problem with parallax.
One long edge is bevelled and the other has a stainless steel strip inset. You can safely use that edge with a knife or scalpel. The strip is rebated, to minimise bleeding.
500mm C-THRU, flat with centre finding scale. 41mm wide.
1000mm C-THRU, has a full-length raised handle for easy lifting and anti-slip pads on the underside. 55mm wide.