This is a double-threaded stud for many different applications for many different GM vehicles. This has a flanged hex nut in the center for tightening this. These are commonly used for engine and transmission mounts. You will receive 1 stud per order. (Contact us for a bulk pricing if you want to purchase a lot of these studs)

M8 X 1.25 X 20 + M10 X 1.5 X 30

Thread Diameter: M8 + M10

Thread Pitch: 1.25mm & 1.5mm

Length: 60mm (overall)

Thread Length: 20mm + 30mm

Hex Head Size: 15mm

GM Part # 11561121

Item is number 20 in the GM diagram.