Overview Product Description 201500 New-No Box; Martin 50BS18-1-3/16 Sprocket # 50 18T 1-3/16"; . Item is New; unused; no factory packaging. Austin Surplus SKU: 201500 Location: 158309-GRG-R01-P12-S04-G-0000615 Product Videos Custom Field MPN 50BS18-1-3/16 Product Reviews