Recently I was researching some gears, because I have always like them and am building a cnc, and I was inspired to make a pendant from a set of pl...

12 teeth, pitch radius 6mm

Gear 20 teeth, pitch radius 10mm

Gear 28 teeth, pitch radius 14mm

Gear 32 teeth, pitch radius 16mm

Gear 36 teeth, pitch radius 18mm

This cog pendant is designed to have the chain or cord run through the hole in the center.

Two interlocking cogs. Run your chain or cord through one, or both holes for two different styles.