Recently I got my hands on this new round cast iron cooking grate. Specifically made in two sizes to fit either the 18.5 or 22.5 inch Weber Kettle Grills, this improved cooking grate is heavy duty cast iron and comes with removable sections (3 for the smaller kettle and 4 for the larger kettle). Aside from the advantage of having a heavy cast iron cooking surface that holds heat and creates strong searing, this system lets you remove the grate sections so you can access your fire or to swap out the sections with other (optional) accessories like solid griddle sections, pizza stone sections, or even a beer can chicken holder. This gives you greater versatility and performance for your charcoal grill.
No, these are not cheap, either in construction or price. The 18.5 inch set including three removable grate sections and the cast iron holding ring will run you about $70USD. If you want an optional griddle section with removal tool (so you can take it out hot) you are looking at another $40USD. The four section 22.5 inch unit costs around $86USD and a single griddle section with tool will run about $40USD.
These prices are not all that far off of buying the whole Weber grill, but the added performance and virtual lifetime durability (properly taken care of) certainly makes these worth the investment. For any serious griller, I would recommend taking a look at this real improvement to your grill.
One additional note, the 18.5 unit fits most any large ceramic cooker, like the Big Green Egg. These will also fit the Weber Smokey Mountain (WSM) Cookers. You can also take these grates camping since you can simply place them over any campfire, supported by a few large stones.
For more information check out their website at: www.cast-iron-grate.com.