100 mm extension, 25.4 mm clamp, classic 58° track geometry.

The stem appears to have never been mounted or only minimally handled.

Chrome is  bright and clean overall.

Please note:

small chrome chip / surface blemish near the engraved MAX marking

a few extremely light storage marks and hairline scratches from handling/storage

wedge, expander bolt and threads are very clean

clamp area is excellent with no over-tightening marks

Beautiful authentic Japanese Keirin / NJS component.