Convert your Truck or ExtraLarge filter crusher to a "Combo Crusher" Use steel plate to insert into the filter crusher to crush smaller filters. Since the truck/extra large oil filter crusher is designed to crush larger filters , it doesn't fully crush smaller (e.g. auto filters). The plate insert will further crush the smaller filters down to the same 75-80% proportion. Easy to insert for crushing smaller filters & easy to remove for normal crushing of larger filters. NOTE: To purchase plate along with a truck or ExtraLarge oil filter crusher, first add the filter crusher to your cart (click"Purchase" button) and after adding the crusher to your cart, the "Check Out" page will allow you to "click here" to add the plate to your order. If you just want to order the plate ONLY, click on the add to cart button below.