Abstract: A terminal comprises a slotted bolt (7), and a cap (10) therefor. The cap has one end closed by a plate (14) with two lugs (11,12) projecting perpendicularly from the periphery of the plate (14) and a central boss (13) with two plane faces (18) opposite the gaps between the lugs. The plane faces have hooks (58) reaching part of the way up them, and the end of the boss beyond the hooks is polygonal. The tool includes a torque limiter (25), a casing (28), and a drive member (29) passing through the casing and made fast to the torque limiter. The casing has two lugs (44,45) and a lock (30) with hooks (39,39') that engage the hooks on the cap. The lugs on the casing fit in between the lugs on the cap, and the drive member has a sleeve (31) at its cap-engaging end with a socket (32) shaped to receive the central boss (13).