30 x 5/32" (3.97mm) Industry Standard Grade 100 Through Hardened Steel ball bearings.

Hi quality hardened chrome bearings manufactured from AISI52100 steel

The Same bearings used in sealed units and fitted to ball race's.

Fully Heat treated to 67 R/C Rockwell C.

Uses include.

Cycling headsets and cranks.

Minature models.

Replacement for damaged Bearings in Race's.

All Bearings Are EX STOCK  And will be

Delivered 1st CLASS post .