A hex key is a six-sided shaped bar bent at a 90º angle at one end. A hex bit is an unbent piece of such a bar.  They are designed to be inserted into a like-sized, hollow recess of a socket cap screw to manually tighten or loosen the fastener.
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HEX KEY 6150 CRV ALLOY, LONG ARM, BLACK (IMPORT) (INCH)

1/16 LONG ARM HEX KEY
Web Price $1,413.04
HEX KEY 6150 CRV ALLOY, LONG ARM, BLACK (IMPORT) (INCH)

1/16 LONG ARM HEX KEY
Web Price $43.52
HEX KEY 6150 CRV ALLOY, LONG ARM, BLACK (IMPORT) (INCH)

5/64 LONG ARM HEX KEY
Web Price $1,517.12
HEX KEY 6150 CRV ALLOY, LONG ARM, BLACK (IMPORT) (INCH)

5/64 LONG ARM HEX KEY
Web Price $46.73
HEX KEY 6150 CRV ALLOY, LONG ARM, BLACK (IMPORT) (INCH)

3/32 LONG ARM HEX KEY
Web Price $1,263.57
Diameter N/A 1/16 N/A 1/16 N/A 5/64 N/A 5/64 N/A 3/32
Pitch N/A
Length N/A
Material N/A Alloy Steel
Finish N/A Plain
Package Quantity N/A 5000 N/A 100 N/A 5000 N/A 100 N/A 4000