A prosthetic or robot part (10), comprising a base(12), a proximal (14) and a distal (16). The proximal(14) is mounted on the base (12) so as to be rotatablethereabout in a given sense. The distal (16) is mountedon the proximal (14) so as to be rotatable thereabout inthe same sense to effect a gripping action of theprosthetic or robot part (10). The proximal (14) and thedistal (16) are rotatable in the opposite sense torelease the grip. One part (34, 36) of a drive (32) ofthe part (10) is pivoted to the base (12) about a basepivot axis. Another part (38) of the drive (32) ispivoted to the distal (16) about a distal pivot axis.The distal (16) is also pivoted to the proximal (14)about the said distal pivot axis. Thus the proximal(14), the distal (16) and the said another part (38) ofthe drive (32) are all pivotable relative to one anotherabout the said distal pivot axis.
