These RCBS factory replacement decapping units are the same ones we ship with our products - so you can rest assured they will work. These replacement decapping units feature an expander rod, expander ball, and decapping pin. They are used in sizing dies to de-prime the case and expand the case neck in bottleneck cartridges. It is always a good idea to keep an extra decapping unit on-hand so you can ensure your reloading sessions do not get interrupted if you ever damage them during use. Factory Replacement Part Precision Machined to ensure concentricity Expander Rod, Expander Ball and Decapping Pin Limited Lifetime Warranty Compatibility 9827 9828 9829 9832 Exp-Decap Unit .416 Taper Exp-Decap Unit .338 Taper Exp-Decap Unit 6mm Taper Exp-Decap Unit .30 Taper .416 Remington Magnum .338-06 6mm x 45 7.5mm x 54 French MAS 29101 9833 9823 9824 Exp-Decap Unit .270 Taper Exp-Decap Unit .35 Whelen Exp-Decap Unit 6.5mm T/CU no available RCBS die .35 Whelen no available RCBS die .358 Winchester