V-Guide Fixed Bushing Adjustibliity Concentric Bore Diameter 0.25 in Bushing Material 303 Stainless Steel Bushing Outside Diameter 0.3748 in Head Thickness 0.281 in Head Width 0.563 in Overall Length 0.706 in Series Redi-Rail Size 2 System of Measurement Inch Wheel Mount Length 0.425 in