This is a 4 pack of 1/2" Tall kiln posts. Kiln posts, commonly referred to as stilts, are used to stack and support kiln shelves during firings. The durable ceramic composition of our posts allows you to stack kiln shelves safely and with confidence during your firings. Since our posts can be fired up to cone 10, they are versatile and can be used in many types of kilns and firings. Kiln posts are available in many size options and can be stacked on top of each other in between shelves, enabling you to maximize the use of space within your kiln. These kiln posts measure 1.5" x 1.5" in width.