Overview Product Description 182784 New-No Box; Martin 120B20-2-7/16 Sprocket # 120; 20Teeth; 2-7/16"ID; . Item is New; unused; no factory packaging. Austin Surplus SKU: 182784 Location: GRG-R16-P09-S01-0012793 Product Videos Custom Field MPN 120B20-2-7/16 Product Reviews