DT pro lock brass Increase the life of a wheel? Only with DT pro lock! This nipple contains an integrated screw locking system - developed and manufactured by DT Swiss. The two-component adhesive in the nipple thread prevents the spoke-nipple connection from loosening under the effect of operating loads (loading and unloading of the wheel during riding), ensuring constant spoke tension. DT pro lock can be mounted mechanically or manually. Available either in brass or aluminum, DT pro lock can be used for all wheels that need reliability, safety and high load capacities. Patent pending and 100% Swiss made.