STANDARD AMERICAN SIZE 3/8" -16UNC x 1": Threaded caster wheels Diamater: 3/8", Stem Length 1", thread dual locking heavy duty caster wheels with brakes easy to install with included mounting hardware, 4 nuts, 4 washers, and 1 spanner, please confirm the required screw specifications before purchasing the stem caster wheels.

RELIABLE STEM CASTERS SET OF 4: The screw in casters frame are constructed of a strong steel material with double ball bearings design is extremely hard wearing and resistant to dirt, the max loading capacity is up to 2200lbs as a set of 4 caster wheels, each wheel can carry 550lbs, it’s good for transporting and displaying quietly and safely, Ideal for save your back and energy to move heavy objects.

FLEXIBILITY & SAFETY: Upper and lower raceways filled with high-quality swivel bearings that enables the casters to rotate 360 degree smoothly, swiftly, flexibly and silently. The 4 casters are encase with superior non-marring polyurethane rubber suitable for all floor types including wood, hardwood, laminate, vinyl, tile and carpet floors.

WIDE APPLICATION-ADDING ROLLING ABIILITY TO YOUR HEAVY OBJECT: The threaded caster wheels are suitable for various indoor and outdoor uses, can be quickly attach to workbenches, instrument cases, barbeque grills, shelving units, and other items commonly found in workshops, garages, kitchens, and offices.

DOUBLE LOCKING DESIGN: This brake simultaneously locks the wheel and the swivel, holding the equipment firmly in place to reduce accidents. This combination wheel brake and swivel lock is essential for safety in some applications, such as on worktables, tablesaws, medical equipment, and used on uneven floors.