Screw holder

These holders are designed for screwdrivers with round shanks. Please see link below for hexagonal shank version.

Four different sizes for shafts with diameter Ø6mm, Ø5mm, Ø4,5mm and Ø3mm. The shaft holes are slightly undersize with an expansion slot to make sure that the holder won´t slip off while working.

I use them by screwing in the screw about half way, retract the screwdriver slightly and release the screw head from the holder arms. 

Then push the holder backwards onto the shaft well clear of the screw head and do the final tighteting. Usually doable with one hand while holding the item to be munted with the other.

Hex shank version: https://www.prusaprinters.org/prints/130207-screw-holder-hex-shank