A set of brand new spacers for VTA adjustment Rega 251 - 301 and all 3 points mounting tonearms.
Made of high-quality resin the set is for three spacers of the following thickness:
1 mm 
2 mm
3 mm
Combining these shims you can adjust the VTA from 1 to 6mm.
 
These spacers are covered with a 2 years warranty and, if this product doesn't meet your expectations, you can return it within 30 days, no question asked.

Glad to answer any question