I tried setting up two at a time, and it worked more smoothly than when using one at a time. Please note that there may be individual differences and variations in the precision of the bridge. For reference, I've confirmed that they fit perfectly on the current R-trem for Steinberger. Set of 12 3 x 8 x 0.5mm Although new and unused, there may be some minor scratches. Please understand this before purchasing. Electric Guitar Steinberger Spirit R-trem TransTrem