A metric hex key is a six-sided shaped bar bent at a 90º angle at one end. A metric hex bit is an unbent piece of such a bar.

They are designed to be inserted into a like-sized, hollow recess of a metric socket cap screw to manually tighten or loosen the fastener.
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USA METRIC HEX KEY 8650 NICRMO ALLOY, LONG ARM, PLAIN

1.3MM LONG ARM HEX KEY DOMESTIC
Web Price QUOTE
USA METRIC HEX KEY 8650 NICRMO ALLOY, LONG ARM, PLAIN

1.3MM LONG ARM HEX KEY DOMESTIC
Web Price $40.16
USA METRIC HEX KEY 8650 NICRMO ALLOY, LONG ARM, PLAIN

1.5MM LONG ARM HEX KEY DOMESTIC
Web Price $1,363.82
USA METRIC HEX KEY 8650 NICRMO ALLOY, LONG ARM, PLAIN

1.5MM LONG ARM HEX KEY DOMESTIC
Web Price $44.13
USA METRIC HEX KEY 8650 NICRMO ALLOY, LONG ARM, PLAIN

2MM LONG ARM HEX KEY DOMESTIC
Web Price QUOTE
Diameter N/A M1.3 N/A M1.3 N/A M1.5 N/A M1.5 N/A M2
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 5000