Primo N4FL V2 Front Hub Axle material: chromo type: female | sealed space between bearings: N/A the axle is 15mm diameter at all points bearing inner diameter: 15mm thread: for 3/8 inch x 24tpi axle bolts length: 99mm additional information: replacement axle for the Primo N4 Flangeless Fronthub will work with fronthub bolts with diameter: 10mm (3/8") & thread: 0,94mm (24 tpi)