BlackOps MX-1100 Sealed BMX Flip/Flop Freewheel Hubset - 36h - 3/8" axles - Black XS It has a diameter a

It has a diameter a 7/8" top for use with seat guts (not included)

You may want to polish them with a soft cotton rag and an aluminum polish to achieve mirror-like shine

This DOES NOT fit Schwinn S-7 26x1-3/4 rims

This BB is designed to be used with old school 1-piece cranks that have a 28 tpi and frames that have a classic American shell

This is a case of 50  20" x 1

BlackOps MX-1100 Sealed BMX Flip/Flop Freewheel Hubset - 36h - 3/8" axles - Black XS It has a diameter aThese BlackOps BMX Hubs are 36 hole small flange, flip flop, sealed cartridge bearing aluminum hubs. These will work with single speed thread on freewheels that are 13t and larger. The one side is threaded 30mm x 1 and the other side is threaded 1. 37 x 24. They have an aluminum shell and are black in color. The OLD is 100mm front and 110mm rear and the axles are 3 8"x26t. Color: Black These are bulk packed so they may have some light shelfwear.