10 Pcs Guitar Luthier Tools Include 9 Pcs Understring Guitar Radius Gauge and 1 String Action Height Gauge Ruler, Measuring Setup Tool Kit for Guitar Bass

Under saddle string gauges will be a big help to let you match your guitar's neck radius. Radius gauge. The correct size allen wrench. Frequently your guitar comes with an allen wrench for this purpose. The Hipshot site says to use a .050 inch allen wrench to adjust bridge saddle height. Allen wrench size to adjust bridge saddles. You can also just adjust each saddle the same amount (like 1/4 turn on each screw) to maintain the radius assuming it is currently set correctly.