1/2" inch (12.70mm) Ball Bearing with 5/16" inch (7.94mm) diameter integrated 1 1/4" inch (31.75mm) Long Axle, Pin Diameter is 5/16" inch, Bearing Outer diameter is 1/2" Inch (12.70mm), and Width of the assembly is 1 1/4" Inch (31.75mm Long), Bearing is made of Chrome Steel.

• Item: 5/16" x 1/2" x 1 1/4" Ball Bearing
• Type: Axle Flanged Integrated Ball Bearing
• Assembly Dimensions: 5/16" x 1/2" x 1 1/4" Inches
• Assembly Dimensions: 0.312" x 0.500" x 1 1/4" Inches
• Size: 7.94mm x 12.70mm x 31.75mm
• Pin diameter: 5/16" (7.94mm axle diameter)
• Bearing Outer Diameter: 1/2" Inch (.500"=12.70mm)
• Width of the assembly: 1 1/4" Inch (31.75mm Long)