1.For the screw, it is processed the hardening and hot treatment, so when we use so much power and put it inside the wall, the nail will be not broken;

2.there is six ways on the cap, this is our new design that can make the expand more strong and anti-skiding;

3.we use the special material for the expand nail; this material can resist the alkali inside the wall so it will not broken so easily;

4. use the yellow green color box packing; it is our patent packing that can make the customer earn much more profit;