Comparison : Item # NB-2Q-03, 2 Inch Diameter Adjustable Height Leveling Feet
Item # NB-25Q-03, 2-1/2 Inch Diameter Adjustable Height Leveling Feet
Item # NB-2SQ-04, 2 Inch Diameter Adjustable Height Security Feet
Item # NB-25SQ-04, 2-1/2 Inch Diameter Adjustable Height Security Feet