Also known as common sense fasteners, turnbutton fastener, turnbuckle fastener or twisted fastener 

Simple twist to lock action

Fastener is positively engaged by simply twisting the knob
Our turnbuttons are perfect for boat canopy and covers especially marine environments. 
They are genuine DOT brand fasteners and have been around for decades, also used by the majority of boat canopy designers. 

Heavy duty nickel plate on brass

Different heights available