The Tequila Tools Black Ice Pick Set is made of black oxide high carbon spring steel. 

7/32" - 9" in length 
1/4" - 15" in length 
5/16" - 21" in length 
3/8" - 27" in length 
7/16" - 33" in length 
1/2 - 39" in length 

You may purchase individually by going to this link .