These heavy duty industrial high temperature nylon casters can be used in both wet & dry high temperature applications up to 475˚F continuously & 550˚F intermittent. The hard treaded nylon wheels roll easily & are resistant to oil, grease, most acids, chemicals & cleaning solutions. These casters have an overall height of 5-1/8 inches from the bottom of the wheel to top of the mounting plate. The mounting size is 4-1/8 inches long by 3-1/8 inches wide. The bolt hole pattern is 3-3/8“ by 2-3/8” slotted out with an alternative bolt pattern of 2-5/16” to 1-3/4”.This mounting plate is common in bakery oven racks & other kitchen equipment. The mounting plate utilizes 5/16” bolts & smaller. All casters swivel to accommodate areas that might be crowded so it can be easily maneuvered in tight spaces. These exact casters are available in one larger wheel diameter 5 inches & two smaller wheel diameters 3-1/2 & 3 inches. We also carry a bakery rack oven caster kit with ball bearing caster wheels to allow easier rolling around the kitchen. Contact Mapp Caster for questions about our products.