SHALLOW / STRIKER PLATE. Placed or buried over underground utilities as protective HDPEeld from machinery and tools during alterations. Shallow Plate is traditionally GQ (General Quality) steel, sold in pieces 2' x 4' - 6' x 9/16"-5/8", depending on local requirements. We offer shallow plate as new and stock as well in 2x4, 2x5 and 2x6.