1/4 Quarter Round

is used when existing moldings are in place and you have to cover expansion space.

Reducer

is used to transition from one height to another (wood/laminate to vinyl).

Square Nose

is used to transition to any vertical surface (sliding glass door/Carpet)

Stair Nose

the Stair Nose molding provides a transition at a step down location.

T Molding

is used to transition between flooring of same heights, different types, (laminate/laminate, laminate/tile).