What is the function of screw extractor?

What is the function of screw extractor? #screwextractor
To remove these screws and bolts Use drill bit size Use extractor size
3/16” - 5/16”, 5 mm - 8 mm, No. 10 9/64” #1 straight
3/8”, 10 mm 3/16” #2 straight
7/16”, 10 mm, 1/8” NPT, 1/8” BSP 15/64” #3 straight
1/2” - 9/16”, 12 mm - 14 mm, 1/4” NPT, 1/4” BSP 5/16” #4 straight
5/8”, 16 mm, 3/8” NPT, 3/8” BSP 3/8” #5 straight
3/4”, 20 mm, 1/2” NPT, 1/2” BSP 15/32” #6 straight
7/8”, 22 mm, 5/8” BSP 9/16” #7 straight
3/32” - 5/32”, 2.5 mm - 4 mm, No. 3 - No. 6 5/64” #1 spiral
5/32” - 7/32”, 4 mm - 6 mm, No. 6 - No. 12 7/64” #2 spiral
7/32” - 9/32”, 6 mm - 8 mm, No. 14 5/32” #3 spiral
9/32” - 3/8”, 8 mm - 10 mm, 1/8” NPT, 1/8” BSP 1/4” #4 spiral
3/8” - 5/8”, 10 mm - 16 mm, 1/4” NPT, 1/4” BSP 19/64” #5 spiral
5/8” - 7/8”, 16 mm - 22 mm, 3/8” NPT, 3/8” BSP 13/32” #6 spiral
7/8” - 1-1/8”, 22 mm - 27 mm, 1/2” NPT, 1/2” BSP 17/32” #7 spiral
1-1/8” - 1-3/8”, 27 mm - 36 mm, 3/4” NPT, 3/4” BSP 13/16” #8 spiral
1-3/8” - 2”, 36 mm - 52 mm, 1” NPT, 1” BSP 1-1/16” #9 spiral
2-1/8” - 2-1/2”, 52 mm - 68 mm, 1-1/4” NPT, 1-1/4” BSP 1-5/16” #10 spiral
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Today we will discuss the screw extractor construction and application.
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