Steel Hand Stamps - Heavy Duty Grade 1/4" inch Number Set
Two grades to choose from:

Standard Grade - High quality at a low cost.  Recommended for medium to light duty. 
Heavy Duty Grade - Large shanks are tempered throughout and are designed to hold up under continuous hard hammering.

Letter sets include 27 characters total, number set includes 9 total characters (0,1,2,3,4,5,7,8,6 reverses to 9)..