20years of professional shutter lock manufacturing Single thickened shoot Blue zinc ... making door locks experiences, like privacy door lock, roller shutter door lock, closet lock , security door lock, tubular ... and lock body.4. OEM is welcomed Name:Center Shutter LockItem No:JF-J19Case Size:155*55*13mmCylinder Dia ... QB/T2476-2000Monthly production capacity:250,000pcs Center Rolling Shutter Lock JF-J19