Grivel's version of the Petzl/Charlet Griprest. It bolts onto the bottom of a Grivel axe or hammer shaft giving a rest for your hand so that you can go leashless and protecting your fingers from the ice.
Fits just about all Grivel axes and has been adapted to fit many other with a bit of bodging.
NB not designed for clipping into for a sly rest etc!
Top tip: Use a vice to clamp the two sides together so that you don't strip the thread from the bolt.
Price is per single item, not for a pair.