Abstract: A buckle type fastener has a body part having a through aperture between its ends. At one end there is means for anchoring one end of a cord, and, at the other end, a nose which is slotted longitudinally of the body in a direction towards said aperture. The slot in the nose has side walls which are convergent over part of the depth of the slot and then divergent towards the base of the slot. This enables a cord of appropriate thickness to be forced into the slot through the constriction formed by the inner ends of the convergent wall parts to become entrapped in the portion of the slot below such constriction.