The source lists the lock or brake configuration as 4-Position Swivel Lock
Cast iron v-groove wheels are made for use with inverted angle track but they can also be used to roll on floor tracks
Wheel Diameter 4" Tread Width 2" Tread Type Rubber Vulcanized To Core Core Type Nylon Bearing Type Sealed Precision Bearing Wheel Color Black Overall Height 5-5/8" Plate Size 4" x 4-1/2" Bolt Hole Pattern 2-5/8" x 3-5/8" to 3" x 3" Bolt Hole Diameter 3/8" Durometer Shore A 80 (+/-5) Temperature Range -40° F to 180° F Model / MPN 28NR40JB6017YY
The double-tier design provides two storage openings per locker for multi-person storage while retaining room for clothing
and OSHA 1910
4" x 1-1/4" DuraLastomer Wheel Rigid Caster Stainless Steel - 350 lbs. capacity 8" Wheel Diameter The source lists the lockProduct Overview The Duralastomer wheel is corrosion resistant, making it a great choice for applications that are frequently washed down. Tread & Core: Solid Cast Polyurethane Elastomer, Non Marking This caster is listed with wheel diameter 4", tread width 1 1 4", load capacity 350 Lbs., tread type Solid Cast Polyurethane Elastomer, Non Marking, and bearing type Sleeve Bearing. Before ordering, verify the listed wheel dimensions, load capacity, bore