Richardson Seating makes the best bolt stools and bolt down chairs in the world. We use cast iron for the bushing that holds the seat and cast iron for the bottom bell. Inside the column are two threaded steel rods and the column itself is 16 gauge steel. We offer the column in chrome, brass, brown, and black. We also offer the bottom bolt cover in this 4 finishes. Since not all floors are the same, we offer three different ways to bolt the stools down to the floor.