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, ... used in building ,channel,bridge construction to fix formworks B cone