You can find a large collection of cheap snap frames in the market such as waterproof, tamper resistant,locking,double sided, window fixing and so on which adds stocks or custom colors to the mix and different kinds of frame with larger sizes so you can see your item in vast size.
I will explain the most common type with its difference between them.
Mitered corners: The frame profile is machined at forty five degrees to create a ninety degree right angle at the corners. The mitered corners effectively works when it is made by natural aluminum or satin anodized finish because for this material this becomes neater and almost seamless in appearance when the profile of the frame are closed.
Rounded corners: Rounded corners are much better than mitered corners because these are brighter and chrome inserts at each of the four sides. Some customers think that if these are used with colored profiles specially the standard red and blue then it will be very effective and a little garish as well. If small children can reach then rounded corners are a good choice with some safety concerns.
You should know that what kind of frame you need or what profile you need.
The name of the profile conveys the feature of the profile itself and also tell what particular snap frame is designed for.
For exteriors waterproof is the best choice because it has a rubber seal which protects your poster from the ingress of the water.
Where unauthorized access may be a problem tamper resistant is suitable for those areas because the profile easily opens with a special tool.
Those areas which may be unmanned mostly lockable is suitable for them. The profiles have a special Allen key locks the final profile in place and sequentially closed and securing the frame completely.
Where there is not an opportunity to wall mount the frame the double sided are usually suspended. In double sided your message can be viewed from both the sides or there may be different message on each sides. It is the benefit of double sided.
When you are fixing the glass window there is a possibility that your messages will be view-able from both the sides. And it’s very easy to change the messages using the snap profiles. It’s a benefit.
Now it’s your turn to choose the right size.
You must remember that the size of the snap frame is the porter size.