The metal top trimmers are available in a closed and open top version. The open top allows you to easily see your work and also fill it without having to remove the top. These trimmers are 100% stainless steel for maximum durability The metal top trimmers are available in a closed and open top version. The open top allows you to easily see your work and also fill it without having to remove the top. These trimmers are 100% stainless steel for maximum durability.