Features: There are 4 settings on the rails mount and the spring detent adjustment is very handy which allows you to easily adjust the distance of the brass catcher to the ejection port. The mounting pieces that goes on the rails is very low profile and fit easily under the scopes. The quick disconnect is easily to use and manipulate. The thickened nylon ensures it will not melt when ejected. There is a zipper in the bottom of the bag so you can empty it without removing catcher from your rifle. Opening is quite large and does not interfere with the ejection of the spent brass case. It can hold a large number of shells before it needs to be emptied. This brass catcher is so versatile that it can be mounted to most any rifles with a rail. Specifications: Material: Nylon Size: As Shown in the Picture Package Includes: 1x note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.