Steel Machinist Engineer Layout Steel Square Kit, 4pc:(1ea) 2" high x 2" base, 4" high x 3" base, 6" high x 4" base, 8" high x 5" base. All vertical blades are hardened spring steel and ground. Bases are hardened and ground. Bases are extra thick design for stability. Offered in wood storage case. For metalworking, sheet metal fabrication & layout. Imported