Graepel-Special 4-18 has a C-shaped profile. The surface features holes arranged in staggered rows, some facing upwards (d = 4 mm) and others downwards (d = 18 mm). The open area for standard grating widths is approx. 21%. Graepel-Special 4-18 offers good slip resistance, a large void volume and good drainage properties. The maximum embossed panel width is 460 mm.