The Wiser Riser manhole cover riser system from Plate Locks is made of strong polypropylene that includes wedge-shaped spacers that bring manhole covers level to street grade, even on an uneven road surface. The wedge-shaped interlocking spacers raise the height of the manhole cover flush with an inclined or flat road surface. They are available in 24-, 25- and 26-inch diameters and 1/4-, 1/2- and 0- to 1/2-inch spacers that allow for precise grade adjustments. The top of the Wiser Riser is imprinted with the type of utility below, i.e. sewer, water, storm drain, etc. – making identification a snap and saving time and resources. 541/821-3622; www.wiserriser.com.