Winches: Old oil and grease lose viscosity and winches will slip when springs and pawls find yourself in trouble. Typical thicknesses are 6mm (1/4") and 10mm (25/64"). Aluma-Lite - Aluma-lite is a good selection for large rigid signs. http://socialnetworkadsinfo.com/story6312180/business-sign-materials-which-an-individual-choose