Pachmayr's Competition Speedloader sets the benchmark for quality and performance. This premium quality speed loader is made of precision CNC machined solid aluminum with a polygon shape for the smallest possible profile and the perfect fit. It's equipped with a rattle dampening o-ring which contacts the base of the round and holds the cartridges firmly in place. Simply twist the large knurled knob to release the cartridges quickly and easily. Revolver shooters that take their competition and self defense seriously use Pachmayr Competition Speedloaders, and you should too!