This Pentax battery grip D-BG2 is compatible with both Pentax K10D and K20D models. This grip is in good, clean, working condition, with the exception of a stuck pin. Please note that this item is being sold "as is" due to the stuck pin, which appears to control the AE-L function - AE-L is not working on this grip, but all else appears to work as intended. Carefully inspected and tested, so buy with confidence. Thanks for looking.