Overview Product Description 234518 New-No Box; Martin 60BS20 1 Bored To Size Sprocket; #60; 3/4"Pitch; 1"ID; . Item is New; unused; no factory packaging. Austin Surplus SKU: 234518 Location: GRG-R14-P07-S03-0002941 Product Videos Custom Field MPN 60BS20 1 Product Reviews