Spacer Bands 1,Size: 15x3" to 22 x4.5" 2,Width: 76.2 to 114.3 mm 3,Type:Channel ,Corrugated 4,Thickness: 3,5 to 4.5 mm Spacer Bands 1,Size: 15x3" to 22 x4.5"2,Width: 76.2 to 114.3 mm3,Type:Channel ,Corrugated4,Thickness: 3,5 to 4.5 mm 5, Inner Dia: 344.88 to 522.68 mm 15X4" Steel Channel Spacer Bands