Description 2 pcs of 1" Block. 1 Pc of 1-1/4" 1-1/2" and 1-3/4" Block. Replaces 639123 and 9120 Monarch This item is a suitable alternative for the following: 952-CST114P, 24098, 589-639123, 589639123, 639123, 873-CST114P, 9120, HC391050