side leg portion 32 b while at least two short barbs 36 y are disposed at a region selected from the first side neck portion 22 a and the first side leg portion 32 a in operation a spring fastener 10 is inserted into the slot 42 of a panel such as a metal sheet for example 44 the short barb 36 y is forced to move under the lower side 54 of the sheet 44 and may or may not touch it depending on the thickness t of the sheet 44 regardless the large barb 36 x remains within the slot since its front point 40 x substantially reaches or exceeds the lower side 16 of the head 12 of the spring fastener 10 since the long barb 36 x is bent toward an inward direction it presses on a side 62 which is close to it and provides the fastener with the tendency to be pushed and be stabilized along a side 60 of the slot 42 which side 60 is close to the short barb 36 y this stabilization takes place within a wide range of slot width w and thickness t of the sheet 44 thus eliminating any wobbling and rattling noises the combination of the two types of barbs also prevents the spring fastener 10 from dropping out of the slot 42 an additional advantage is that if the width.