Yakima Universal Locking Skewer The Yakima Universal Locking Skewer is a replacement bike skewer for the Yakima Viper, Boa and Copperhead bike mounts, as well as the locking BedHead and Blockhead truck bed bike mounts Love it 'Till You Leave It Limited Lifetime Warranty. The Yakima Universal Locking Skewer is a replacement bike skewer for the Yakima Viper, Boa and Copperhead bike mounts, as well as the locking BedHead and Blockhead truck bed bike mounts