B cone , P cone ,D cone used with B form tie and rib washer to fix formwork in building construction we are a Chinese manufacturer of construction formwork accessories and building 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, ...