Scalping screens MSS are built with a rugged, heavy-duty design for large feed and tonnages. These screens are most commonly utilized in conjunction with an apron, pan or push feeder ahead of the primary crusher. They have a single grizzly or plate type of scalping deck with the option of a second deck with woven wire. MSS screens immediately after a primary feeder gives more effective scalping than a primary feeder with a built-in grizzly. The stroke and speed of the screen remains constant while the feed rate is adjusted by varying the feeder speed providing efficient separation at all times.