Convert everybody’s favorite EDC with 1/4″ hex driver to a 1/4″ square socket driver for $5.This tiny adapter bit contains the retaining grooves on the hex bit side. If your not interested in the retaining grooves, and this minimal size, then you can find these bits much cheaper.Great little EDC bit; only 20cm (roughly 3/4″) long. If space is not an issue, I prefer the less expensive, more common, impact driver bit adapters – which are about 50cm (2″) long; the longer ones provide more gripping surface to remove the bit.