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, SHORT ARM, PLAIN

1.5MM SHORT ARM HEX KEY DOMESTIC
Web Price $862.44
USA METRIC HEX KEY 8650 NICRMO ALLOY, SHORT ARM, PLAIN

1.5MM SHORT ARM HEX KEY DOMESTIC
Web Price $27.90
USA METRIC HEX KEY 8650 NICRMO ALLOY, SHORT ARM, PLAIN

2MM SHORT ARM HEX KEY DOMESTIC
Web Price $901.56
USA METRIC HEX KEY 8650 NICRMO ALLOY, SHORT ARM, PLAIN

2MM SHORT ARM HEX KEY DOMESTIC
Web Price QUOTE
USA METRIC HEX KEY 8650 NICRMO ALLOY, SHORT ARM, PLAIN

2.5MM SHORT ARM HEX KEY DOMESTIC
Web Price $1,154.21
Diameter N/A M1.5 N/A M1.5 N/A M2 N/A M2 N/A M2.5
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