US box screw M4 x 20 with square nut

Quality stainless bolt machined for generic board pressure valves. No need for screwdriver - in fact use of a coin is recommended to prevent 0-Ring and plastic thread damage from over-tightening...

  SUP & Windsurf Boards Fin 23cm US Box * FIN SCREW & SLIDER SET - NOT INCLUDED

Cobra Footstrap Screw: Available in 7 x 32 mm & 6 x 32 mm.    

Tendon joint pro 20mm diameter with holes