"You should buy this 10mm Nut Head Bolt (fits Lexmoto Echo Luggage Rack)"

An Allen bolt, also known as a hex socket bolt, is a type of fastener characterized by a hexagonal socket in its head. It requires an Allen wrench (or hex key) for tightening or loosening. Commonly used in motorcycles, Allen bolts are preferred for their clean appearance and the ability to provide high torque without damaging the fastener.