The RCBS Quick Change Metering Screw Assembly can be used to convert your ordinary RCBS Uniflow Powder Measure into a powder measure with Quick Change capabilities. With this metering screw assembly, your ordinary powder measure gains the features of the RCBS Quick Change Powder Measure. The RCBS Quick Change Powder Measure not only has the capacity to load a variety of different calibers, but also makes the process of switching between calibers quick and easy. This metering screw assembly is made from hardened steel, so you can be sure that it will last a lifetime.