I bought these to replace some similar bolts missing from a used crib by using them with cross nuts. I looked for 3" 1/4-20 threaded bolts and these (80mm long) were close enough. The only problem was that the head diameter was just over 5/8" (maybe 16mm) and larger than the countersink for the screw holes. I had to reduce the diameter of the head (using my bench grinder) to about 7/16 inch. The description does not indicate the diameter of the head, so without an asterisk. . . But they are actually good screws and require a 4mm Allen key to install.
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