Pinhead Seat Collar Lock. Brick Lane Bikes: The Official Website
Pinhead Seat Post / Saddle Lock
Pinhead Quick-Release 4-Pack Locks
Pinhead Bike Saddle Anti-Theft Lock for 31.6mm & 27.2mm Seatposts 564-P12 | eBay
Pinhead Seatpost Clamp Lockset for HSD and GSD | Tern Store USA
Today I installed pinhead locks to my RadExpand 5 seatpost and front wheel. Those were the only parts compatible, but feels justified for the cost of replacements! : r/RadPowerBikes
Pinhead locking skewers, etc for Evo Cross? Better alternative? | Electric Bike Forums
Pinhead Bike Saddle Anti-Theft Lock for 31.6mm & 27.2mm Seatposts 564-P12 | eBay
Pinhead Seatpost/Saddle Lock : Bike Saddles And Seats : Sports & Outdoors - Amazon.com