The clips are used to hold binding on when you are sewing it to your quilt. It keeps you from being poked over and over by the pins. http://www.joann.com/search/_clover%20wonder%20clips/

here is a video that shows them in use. http://m.youtube.com/#/watch?v=XFxsx...%3DXFxsxY3eSRQ

http://m.youtube.com/watch?v=CK51T8B79DA&feature=fvwrel

I found mine at Hancock's(50count). Use a Joann's coupon!!!
Joann's has 10count in the store, 50 count package online.
Can't say I use them for hemming jeans, all legs here, I need the length!
I do love them for holding the binding while hand sewing!

I use them to hold fabric to my hexies instead of pinning to get them ready to baste. I have the 50 count box and set up a bunch of hexies with the clips, then baste them all, rinse and repeat! Seems to go a lot faster for me this way and the fabric is not distorted by the pin

Also clothes pins work well for hemming, especially if you run a bit of washable school glue (Elmer's, etc.) around inside the turned up fabric that's to be stitched down.

I also use clothes pins for bag-closing clips. Cheap, multi-purpose, rarely break.

I bought my Clover Clips on Amazon for $14 for 50! I use them to group scrap blocks when making a Bonnie Hunter scrap quilt. I'll make stacks of say 10 blocks and clip them together rather than getting stuck with pins.