This is for the RCBS Rock Chucker Supreme only. It has clearance for rough casings. To install simply place left side of catcher in press casting groove and drop right side into position. If it is too tight with your ram there is a small fillet at the bottom of the primer catch opening that can be gently sanded down. You will need to supply your own 1/2" or 13mm tubing. There is a plug included for the tube bottom. These are 100% Made In The USA! Support Small Business! Check out our other reloading gear listings! If you would like something custom made please feel free to send us a message and we will get it done for you!