Overview Product Description 205241 New-No Box; Martin 50B21SS-1 Sprocket # 50; SS; 21Teeth; 1"ID; . Item is New; unused; no factory packaging. Austin Surplus SKU: 205241 Location: 162271-GRG-R01-P14-S04-H-0004921 Product Videos Custom Field MPN 50B21SS-1 Product Reviews