Delete record comparing two internal tables in single shot

hi,

i have two internal tables  IT1 and IT2 .

my first table   IT1 contains 161,482 records and another table IT2 consits of 13,500 records

my requirement is that i need to delete records in  IT1 which are not found in IT2.

i can do with loop and read statements by checking the conditons but it takes time.

so is there any syntax or staments which can delete the records comparing IT1 and IT2 at a

single strech.