Roller Wheel Closure Open Drive Type Hex Socket Duty Type Standard Face Design Hex Socket Overall Length 45.5 mm Roller Diameter 58 mm Roller Head Type Flat Roller Material Nylon PA Glass Fiber Reinforced Roller Width 30 mm Rolling Element Rows 1 Seal Type Not Applicable Stud Material Carbon Steel Stud Thread Size M8-1.25 Stud Type Concentric System of Measurement Metric Bearing Type Ball Bushing Drive Location Stud Features Includes Mounting Hardware