8

What is the difference in the method of construction? Differences between the frame structure and the pressure-welded structure [Grating Trivia]
奥岡製作所
The biggest advantage of the "structured form" is that it has fewer dimensional tolerances!
42

Grating with weight reduction mechanism "Escargot" [Can be opened and closed with 1/3 of the force]
石田鉄工
A grating that can be opened and closed with one-third of the force! It is ideal for places that need to be opened and closed frequently, such as snow melt gutters.
42

Guerrilla rain response theft prevention disaster prevention type drainage cover | Vacuum grating
宝機材
Disaster prevention - heavy rain response - and crime prevention - theft prevention - are standard features, yet they are priced the same as typical steel grates.