Roller Wheel Bracket Assembly, Carriage Height 21 mm, Carriage Length 123.3 mm, Carriage Width 40 mm, Carriage Material Aluminum, Roller Material Nylon, Requires Lubrication Lubricant Not Required, Carriage Type Roller, For Use With T-Slot Profile, Series 40, Carriage Finish Anodized, Roller Finish Anodized, System of Measurement Metric