We, Shanghai Jian&Mei Industry and Trade Co.,Ltd,are leading company with 15 years??experience in fastener and hardware products export business. Though you need much different screw as manufacturer of Windows&Doors, our major products in non-standard stamping parts, turning parts ,bolts,nuts and washers, can be manufactured by the drawing and samples.The cold forging and hot forging are all ok for us.Our delivery time of sample is within 15 days.