We have taken our Simple Mounts and added our new Speed Lock Feature to them. The New Locking Simple Mount Comes in three sizes. These mounts are made from steel and come in our Endurance Powder Coat Black Finish. A lynch clip or padlock is all that is needed to store the locking pin in the "unlocked" position while the dolly is in use. Each Mount is sold individually so you need to order two (2) to make a set. These will also fit previous models of In The Ditch dollies!