PUMA (Made in Taiwan) Air HammerModel AT2010/H (Chiesel Shank 10.4mm) Piston Stroke 41mmModel AT2010/R (Chiesel Shank 10.2mm) Piston Stroke 41mmModel AT2020/H (Chiesel Shank 10.4mm) Piston Stroke 66mmModel AT2020/R (Chiesel Shank 10.2mm) Piston Stroke 66mmModel AT2030/H (Chiesel Shank 10.4mm) Piston Stroke 92mmModel AT2030/R (Chiesel Shank 10.2mm) Piston Stroke 92mm