Replacement screw for Bach tenor and bass trombones with standard rotary valves. This screw, which threads into the center rotating rotor post, is used to hold the rotor stop arm (armature or bell crank) in place. Stainless steel. -cdp
• Slotted screw cap • 10.1mm (0.4-inch) overall length • 2.43 mm diameter thread • 7.88mm diameter cap • 0.45 metric thread pitch