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Oh how sweet this is . Yes that is a turned down Ti bolt in the center to reduce weight
Titanium M10x1.5x115 Hex Head Flange Bolt - RaceTech Titanium
Titanium M10x115 Hex Head Flange Bolt Hex Size – 12mm Hex Height – 7mm Flange Diameter – 17.5mm Flange Thickness – 2mm Thread Length – 21mm Thread Pitch – 1.5 Shoulder Width – 8mm Shoulder Length – 54.5mm Thread Pitch – 1.5 6AL-4V Titanium Rolled Threads Dished Head Heat Treated CNC Machined...
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