MASTER THREAD REPAIR KIT UNC – 1/4  5/16  3/8  7/16  1/2
HELICOIL TYPE
THIS SET CONTAINS ALL YOU NEED TO REPAIR THREADS IN THE FOLLOWING SIZES
1/4 X 20
5/16 X 18
3/8 X 16
7/16 X 14
1/2 X 13
INCLUDED ARE
ONE HSS SECOND TAP FOR EACH SIZE 1/4  5/16  3/8  7/16  1/2
ONE PRECISION GROUND HSS DRILL FOR EACH SIZE 6.7 MM 8.3  MM 9.9  MM 11.6  MM 13 MM
TWO INSERT TOOLS FOR EACH SIZE 2 EACH NO 9 10 12 14 15
PLUS A GOOD SUPPLY OF THREAD INSERTS FOR EACH SIZE

25 X 1/4  5/16

20 X 3/8

15 X 7/16  1/2

All in a handy wooden storage box