Iittala Tools Collective stainless steel cake knife or pie server. Collective Tools are objects that encourage a love of food. The range is carefully assembled to provide you with a complete toolbox for modern dining with which to entertain. The user experience is at the heart of every Iittala design, and Collective Tools is no exception. The iittala stainless steel line of Collective Tools is beautiful and functional and act as a collective to serving that can stand alone against any contemporary flatware.