Steel Lintels Ireland - Stockist for Catnic Steel Lintels & Special Lintels Steel Lintels Ireland are the sole stockist in Ireland for Catnic Lintels. We can supply lintels to suit any size & shape. We also manufacture special lintels for arch, corner and bay windows, we also produce sunrooms lintels. If you have a design idea then we can work with you to design a special lintel for you needs.