What is the length of the 8mm variation of the hex key?

20cm from blue head to end of the hex key(long). The head part has a length of 10.3cm(shortside). I have 5mm hex key and I use it for my MTB and it works great, especially a long side in tight places that needs torque, built like a rock and light weight.

What size for pedals?

It depends on your pedal. Some pedals like Crank Brothers use a hex wrench; Crank Brothers uses a 8mm hex. The Park Tool Ph-8 would handle this although the Ht-8 is better because you'll get more leverage with its longer handle. Other pedals use a 15mm cone wrench like the PW-5.

Color	Blue
Brand	Park Tool
Material	Nylon
Item Length	8 Millimeters
Item Weight	0.13 Kilograms
Item Package Quantity	1
Head Style	Hex
Finish Type	Painted, Polished
Operation Mode	Mechanical
Manufacturer	Park Tool
UPC	763477005571
Global Trade Identification Number	00763477005571
Item Package Dimensions L x W x H	11.5 x 5.63 x 1.14 inches
Package Weight	0.17 Kilograms
Item Dimensions LxWxH	4.5 x 1 x 10 inches
Brand Name	Park Tool
Suggested Users	Cycling
Number of Items	1
Part Number	0763477005571
Model Year	2018
Style	Durable
Size	8mm
Sport Type	Cycling

PH with Hexagonal Key p-handle

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