Manhole Cover and Sewer Grating Set, 1/160 scale. 2 each of 3 different style mahole covers, and three gratings. Cut at 1200 dpi for maximum detail and sharp resolution, these actually take slightly more machine time to manufacture than the HO scale version, due to the extremely fine detail. For example, the words "sewer" and "drain" can be made out. Replicas of actual NYC street details. Covers measure 5.75mm to 6mm, gratings are 7.5x4mm. US Quarter in photo is size reference. Laser cut and relief engraved in durable dark brown .025mm Laserboard.