Pressed Metal Series Try our Product Finder Use Product Finder 501 Ideal drainage solution for the residential, pedestrian and cyclist precinct, such as cyclist paths, walkways, gardens and more. Sizes Available: Internal MeasurementExternal Measurement 100mm x 50mm150mm x 100mm100mm x 100mm150mm x 150mm100mm x 150mm150mm x 200mm150mm x 100mm200mm x 150mm150mm x 150mm200mm x 200mm 508 Ideal drainage solution for the residential, pedestrian and cyclist precinct, such as cyclist paths, walkways, gardens and more. Sizes Available: Internal MeasurementExternal Measurement 100mm x 100mm150mm x 150mm