Abstract: Spring clips with nesting end portions are disclosed for use in securing heat generating electrical devices to a support surface, such as a heat sink. The nesting end portions of the clips depend downwardly below the main body portion to prevent contact with edges of electrical devices of varying height and width. Thickness and temper of the clips provide some flexibility so there is less variability in clamping force applied to the clamped devices by the clip in response to tightening of the attachment means and torquing of the fastening means becomes less critical.