Replacement sprocket adaptor to fit a 22mm or 19mm spindle from a 23.8mm bore hole. Size: 19mm / 5mm,  22mm / 5mm, 19mm / 2.6mm Weight: 10g (0.35oz) Features: Available in 2.6mm x 19mm, 5mm x 19mm or 5mm x 22mm Outer diameter of 23.8mm, for steel (2.6mm and thicker) and alloy (5mm and thicker) sprockets 19mm and 22mm spindle options (on 5mm adaptor)