Hilti Hammer Drill Bits (4) 7/8"x21" 18mmX21" 1/2"x14" 1/2"x14" 0's worth of bits. These all have 18mm shanks; MAKE SURE 18MM IS THE SIZE YOUR DRILL USES! All are unused except for one of the 1/2" bits. Models are TE YX 18/52 TE YX 7/8-21 AND 2 that are 1/2"x 14".