Low stress stamp (pitting) Gauge: 3/32 ", 1/8", 3/16 "1/4", 3/8 ", 1/2" (character height) low stress stamp (continuous ) Standard Specifications: 3/32 ", 1/8", 3/16 ", 1/4", 3/8 ", 1/2" (character height) Buttress Buttress rebar printed font height 3/8 "equilateral triangle, low stress, pitting, continuous, APIQ sign stenciled Standard Model: 1/8 ", 3/16", 1/4 ", 5/16", 3/8 ", 1/2", 5 / 8 ", 3/4", 1 "(character height) Seal safety handrail standard model: square hole Size: 1/4", 5/16 ", 3/8", 7/16 ", 1/2" 9 / 16 ", 5/8", 3/4 ", 7/8", 1 ", 1-3 / 8" rectangular hole Specifications: 3/4 "x 1" can be non-standard custom