The canning Rack are used to keep jars off the bottom of the pressure cooker / pressure canner while canning. This will allow you to safely stack one more layer into your pressure canner, speeding up your canning. Made For Large Pressure Cookers / Pressure Canners Compatible with Presto, All-American and More Please Measure Your Pressure Cooker/Canner Before Purchasing To Ensure Fit -- It must have 28cm of usable interior diameter - If Not, This Will Not Work For You Ideal For Canning -- Our racks are great for keeping jars off of the bottom of the pressure cooker / pressure canner while canning. Our 2-pack allows you to create multiple layers in a batch which will speed up your canning High-Quality Material And Construction -- Made from durable stainless steel, our canning racks are built to be used over and over again!