Lug nuts may be removed using a lug, socket or impact wrench. The bolt is a dual front locking lug. The 1/2 ton 4 x 4 retained the 6 lug bolt pattern. Locking grooves attach to the bayonet lug on the rifle. In all versions, the bolt handle itself serves as an emergency locking lug. This can also tilt the bolt during extraction, leading to increased bolt lug failures. A single large locking lug is used to secure the breech. Torque-wrench type keys are available, graphically revealing the torque at each lug. Rally II wheels with colored lug nuts were also available in 1967. The M234 mounts on the muzzle, bayonet lug and front sight post of the M16. It adopted a version which featured a bayonet lug but no stacking rod. It has to have appropriate holes for the center hub and lug nuts. The front band had a bayonet lug. The Uzi features a bayonet lug. The front sight is winged and incorporates a bayonet lug.