Unlike the dainty factory units that can be removed with a chisel in two seconds, mcgard wheel locks are proven, reliable, and bulldog tough. Mcgard uses the actual lug bolt or lug nut to secure your wheels, not a flimsy cover like many other brands. Thread size m 14x15 bolt, 17 mm hex size. These have the 40mm shank for all 914 fuchs mahle and pedrini four lug wheels