Number Set Character Height 1/4 in Character Type Set Double Digit Number Set Characters Included 90 to 99 Duty Heavy For Maximum Surface Hardness 50 on A Rockwell C Scale For Shank Diameter 9/16 in Holder Length Not Applicable Holder Shank Size Not Applicable Impression Character Style Round Face Includes (10) 90 to 99 Product Type Hand Stamp Kit Shank Length 3 in Shank Thickness 9/16 in Shank Width 9/16 in Stamp Material Steel Standards Not Applicable Case Material Wood