... an important role to srenghten the mortar. Groove joint play an important role to the plaster whitewashing. ... process of construciton. The groove joint can strengthen the wall of firmness. Groove joint operation is convenient,easy and ... timeFeature: firm, durable, elegant appearance,etc.About groove joint Products NoGDBLengthPacking/boxcolorsPB24-110mm6mm18mm2m—2.7m100White or grayPB24-215mm10mm25mm2m ...