Replacement drill chuck key for 5/8" capacity chucks marked RJ3-16L. Commonly found on Jet / Wilton / Powermatic drill presses such as JDP-10, JDP-12, JDP-14MF, JDP-15M & JDP-17MF plus many Craftsman models including # 137229130, 137229150, 137229340, 137273350, 137273370, 137273390, and many others. Equivalent to # CK-16 or 2136ABD104.