... fastener such as form tie,plastic cone,B-cone,D-cone,inner unit, D-form tie,pin,wedge,wedge pin,form tie ... ,B-cone,D-cone,hex nut,flat tie ,wall tie,tie rod,wing ... nut,scaffold coupler,u-clip,hook,expansion anchor bolt,chain roller,implosion nut ,cutting wire and ... are used in building ,channel,bridge construction to fix formworks 3 type rib washer