Lego® Technic 15100 Connector Pin with Friction and Pin Hole (black)
Brickset: A history of Technic pins | New Elementary: LEGO® parts, sets and techniques
LEGO PART 18654 Technic Pin Connector Round 1L [Beam] | Rebrickable - Build with LEGO
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10 NEW LEGO Technic, Pin 1/2 with Friction Ridges Dark Bluish Gray | eBay
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Amazon.com: Classic Building Technicall Pin with Friction Ridges Lengthwise and Center Slots 100 Piece, Compatible with Lego Parts 2780, Creative Play Set - 100% Compatible with Lego(Colour:Black) : Toys & Games