EXHIBIT 4.1

GRUPO IMSA, S.A. DE C.V.

	Name	Jurisdiction of Incorporation	Doing Business as
1	IMSA ACERO, S.A. DE C.V.	Mexico	—
1-1	IMSA-MEX, S.A. DE C.V.	Mexico	Imsa-Mex
1-2	INDUSTRIA GALVANIZADORA, S.A.	Guatemala	Ingasa
1-3	IMSA STEEL, CORP.	U.S.A.	Steelscape Imsa
2	ENERMEX, S.A. DE C.V.	Mexico	—
2-1	ENERTEC MEXICO, S. DE R.L. DE C.V.	Mexico	Enertec México
2-2	GES AMERICA, L.L.C.	Delaware, U.S.A.	GES America
2-3	ENERTEC DO BRASIL, LTDA.	Brazil	Enertec do Brasil
2-4	ENERTEC ARGENTINA, S.A.	Argentina	Enertec Argentina
2-5	ENERTEC VENEZUELA, S.R.L.	Venezuela	Enertec Venezuela
3	IMSALUM, S.A. DE C.V.	Mexico	—
3-1	CUPRUM, S.A. DE C.V.	Mexcio	Cuprum
3-2	VENTANAS CUPRUM, S.A. DE C.V.	Mexico	Ventanas Cuprum
3-3	LOUISVILLE LADDER GROUP, LLC	Delaware, U.S.A.	Louisville Ladder
3-4	ESCALERAS, S. DE R.L. DE C.V.	Mexico	Escaleras
3-5	TIENDAS ALUTODO, S.A. DE C.V.	Mexico	Teindas Alutodo
4	IMSATEC, S.A. DE C.V.	Mexico	—
4-1	EMPRESAS STABILIT, S.A. DE C.V.	Mexico	Stabilit; Glasteel; Graham; Resolite
4-2	IMSA ITW, S.A. DE C.V.	Mexico	IMSA Signode; IMSA Paslode; STAHL
4-3	FORJAS METALICAS, S.A. DE C.V.	Mexico	Formet
4-4	MULTYPANEL, S.A. DE C.V.	Mexico	Multypanel

4-5	METL-SPAN, CORP.	Texas, U.S.A.	Metl Span
4-6	GRUPO IMSA CHILE, S.A.	Chile	Grupo IMSA Chile; Varco Pruden Chile; Tecnosteel
4-7	BAYER IMSA, S.A. DE C.V.	Mexico	Bayer-IMSA
4-8	VALMONT FORMET, S. DE R.L. DE C.V.	Mexico	Valmont Formet
4-9	VARCO PRUDEN HOLDING, INC.	Delaware, U.S.A.	Varco Pruden Buildings; United Panel; ASC Profiles
4-10	IMSA VARCO PRUDEN, S.A. DE C.V.	Mexico	IMSA Varco Pruden
4-11	ASC PROFILES INC.	Washington, U.S.A.	ASC Profiles