Wooden wheel casters with a brass plated stamped steel Fork. This style of casters was widely used on chairs, tables, desks and other household furniture. CT-101 has a wheel that is 1-5/8"diameter and is 3/4"wide. The pin: is1-9/16"long with a 1/4"diameter. each caster supports up to 90 pounds. CT-104 has a wheel that is 1-1/4"diameter and is 5/8"wide. The pin is 1-9/16"long with a 1/4"diameter. Each caster supports up to 75 pounds. Please note that that this style of caster was frequently used with a steel stem that was placed in a whole in the bottom of the leg. The caster stem was secured by inserting it into the insert. Our CT-115 is suitable for use with these casters.