These are all anodized and color coated to make it easy to recognize which size you have in. These fit all uppr control arms with caster clugs. These are machined and designed at Day Racing Products. These come in a full pack of 9. 
Sizes:
- 0"
- 1/16"
- 1/8"
- 3/16"
- 1/4"
- 5/16"
- 3/8"
- 7/16"
- 1/2"
 
Adjust upper control arm mounting position as part of your race car caster setup. Choose the listed size and quantity to match your mounting hardware.
 
Caster-adjustment slugs for compatible upper suspension mount assemblies. Select the correct size and quantity to suit your front-end alignment needs.