With this Hammer Grab, we can pull up the inside broken stones and fine mud after inserting the casing in case of ROTARY CASING DRIVER construction, that is to say, we can drill and pull up the sands inside the casing which were lowered from the appropriate height with the help of the grab.

 HAMMER GRAB FEATURE

- As it is devised streamline and cylinderical shape to play the maximum lifting effect in the geological stratums being affected deep water pressure and mud water resistance, the dropping speed can be faster, so the working efficiency is greatly improved.

-The special steel plate is used for the blade part of shovel and weak part to impact so that the more impact abrasion is affected, the more hardness on the surface will increase, and the inner layer maintains high ductility, and therefore, damage or crack due to impact will never be happened, and the thin and long blade of shovel is manufactured.

- It is devised that needle bearing is used for tackle of closed type, so its life is prolonged, endures impact load and grease can be filled in, and therefore, maintenance at the job site is easy.

- It can be used under any condition on the shore or marine, and is manufactured to have greatly changeable of parts according to excavating caliber, so the maintenance and repairing cost is low.