I was wondering to myself what would need to be changed to get the 1/4 inch bits to stay in the 1/4 slot in a doohickey. But the 1/4 hex bits are too wide for the slot. I mention this in case any of you were thinking that a doohickey and some bits might be useful. Take out the file now and make sure they actually fit, and maybe add a divit for a rubber ring which was my original though.