There are 2 possible lengths when it comes to this part (standard is 7mm for an 8mm thick frame, in some special frames you would need the 5mm for a 6mm thick frame).

7mm saver:  BD-S27   and 5mm saver:  BD-S06

Tap - M10 X 1 (standard derailleur hanger's tap)

For those of you who don't have a replacable derailleur hanger in their bike and have managed to ruin the tap in the frame itself that connects to the derailleur.

How do you do this? Just drill a 12mm (0.472 inch) hole where the tap used to be (frame) and insert this piece with the hexagon facing the other way from the derailleur (the hexagon doesn't want to see the derailleur) and screw in the derailleur....you're done.

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