We've compiled a list below of every coupler adapter you will ever need.    Teng Tools Coupler Adapter List Item ID Drive DIN Description Length Weight M140060-C 1/4" 3126 coupler adapter for 1/4" hex bits 25mm / 1 in 20g / 0.7oz M380060-C 3/8" 3126 coupler adapter for 1/4" hex...