These tools are the ‘Al-Orr’ brand granite lettering, made using a 3/8” (10mm) shank. The tools differ from the marble type tool in the grade of tungsten carbide and the approach angle of the tip. The tungsten carbide tip sizes range from 1/8” (3mm) to 1” (25mm). These tools are for use with granite and all other hard stone. The tools come with three different striking ends; Hammer Head, Mallet Head and Pneumatic.