Self drilling screws hex head with neoprene washer assembled small boxes per 500pcs 6.3x25-250000pcs 6.3x32-150000pcs 6.3x40-40000pcs 6.3x60-20000pcs 6.3x75-80000pcs 6.3x100-30000pcs 6.3x120-40000pcs 6.3x140-30000pcs