USA made by DESCO. These screw extractors will cover any job up to 7/8". They have the square flute design so they won't spread the bolt. You get #1 to #7 in a wood block where each easy out has its own place.

No.	Removes Bolts & Screws	Drill Size
1	3/16" to 5/16"	9/64"
2	3/8"	3/16"
3	7/16" to 18" pipe	15/64"
4	1/2" to 9/16" & 1/4" pipe	5/16"
5	5/8" & 3/8" pipe	3/8"
6	3/4" & 1/2" pipe	15/32"
7	7/8"	9/16"

SKU: 6912D