Silver tone Star 4 piece set Saddle Blanket pin, 20mm (.79 inch) shaft length.  Designed to hold number signs for Western weave blankets for Western Pleasure and Ranch showing using a 1/2 inch blanket.  
These would work on an English saddle pad too, please check your pad thickness.  

Frustrated with safety pins?  These are a fantastic solution - easy, fast, look great and hold well!  
Fastens in the back with a rubber backing (extras included) Color backs may vary.

Quality materials - metal alloy and steel pins.  

I have many different options not listed, so if you are looking for something different or with more bling please reach out!