Lee Precision Carbide Sizing Die .38 ACP / .38 Super Lee Precision Carbide Sizing Dies use a solid carbide sizer ring which has been ground and polished with diamond wheels to eliminate the need for case lubrication. They leave no belt mark and they will never wear out. The collet held decapper is nearly unbreakable even if you miss-adjust it. And it is strong enough to decap military cases with crimped primers. The collet clamp accurately centers the decapper in the die. Should you over stress the decapper for any reason, it harmlessly slides up without breaking and is easily reset.