... Construction : SteelCase Material: Heavy Duty PlasticImpression Letter Type : Low Stress Dot DesignIndication Character and Size are Marked on Thumb SideStandards Meets ... Energy SpecsIncludes 27 Pieces A Thru Z and an Ampersand. Dot character design provides minimum stress on the marked metal. Capable ... Rockwell C. Letter Punch ,Hand Steel Stamp, 1/2 In, Dot Design, Letter Set