A fastener-installing tool comprises a housing (1) in which a collet (2) which holds a fastener moves back and forth between a forward fastener-installing position and a rear loading position. A curved feed tube (6) is pivoted on the housing (1) to swing about its centre of curvature into a fastener delivering position in front of the retracted collet (2) to feed into it a fresh fastener delivered through a hose from a supply. The feed tube (6) swings out of the path of the collet (2) when it next advances. The fastener-delivery means is simple, reliable and economic.