Product review (5 stars): Excellent product, might be included in your install kit though...
As many have posted, this thing is great for awkward installs.  Before ordering on Amazon, I searched the big box hardware stores by me and none of them had this product.  I knew I needed at least one of these to make the most of our L-shaped laundry room.  I had purchased a new dryer and was required to pay for an installation kit, but I didn't know what it would contain.  Turns out, the dryer installation kit (Best Buy, aka Pacific Home Kitchen whatever) included 2 of these and they used them both.  I didn't use mine, but it isn't worth returning.  I'll keep it for next time or give it to my dad if he needs one.