SELF DRILLING SCREW ,COMPETITIVE PRICE HIGH QUALITY ALL SIZE OF SELF DRILLING SCREWPACKING: BULK CARTON OR SMALL BOXDELIVERY TIME: 500TON PER MONTHPAYMENT:TT OR L/CQUALITY: GOOD QUALITYMAIN MARKET: RUSSIA,MIDDLE EAST,EURO,SOUTH AMERICA,AFRICA,SOUTH ASIA... CSK HEAD SELF DRILLING SCREW