Hoppe's No. 9 Conversion Adapter Clotted End, .30, .38, .45 Caliber Can be used with patches Compatible with all HOPPE'S cleaning rods Made of quality materials 100 percent designed and tested Hoppe's No. 9 Conversion Adapter permits interchangeability with non-standard size threads Intended for use with .30, .38, .45 caliber This is a great, easy to use adaptor