Clutch (pin fastener) - Wikipedia

2.25x.5x.5 (approx) steel bar with rounded upper surface containing two unequally spaced circular fasteners(?) with small round dimples. [Not typical screw fastener] What is this for? : r/whatisthisthing

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JANYUN 120 Pairs Butterfly Clutch Tie Tacks Pin Back Replacement with 8mm Length 4mm Width Blank Pins for Craft Making (4mm, Silver)

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JANYUN 120 Pairs Butterfly Clutch Tie Tacks Pin Back Replacement with 8mm Length 4mm Width Blank Pins for Craft Making (4mm, Silver)