Pergo Four-in-One Molding, everything you need to complete your laminate floor comes in 1 single kit. This patented innovation allows assembly of 4 different moldings from a single product. Four-in-One molding allows you to assemble 4 different trim pieces from a single product. Join laminate flooring with a similar height hard surface floor with the t-molding. Use in doorways with a width of 4 feet or less, or in rooms 40 feet or larger in length or width. To transition laminate flooring to a carpeted floor use the carpet transition. Use the hard surface reducer to transition laminate flooring to a lower, hard surface floor, such as vinyl, wood or tile. Finish your laminate flooring installation at sliding doors, fireplaces or other fixed edges with end molding.