Metaltech's 4 in. Heavy Duty Scaffolding Caster Wheels provide added security and control, preventing accidental rolling or shifting when in use. The double-locking mechanism ensures the casters stay in place, even on uneven surfaces or when extra weight is applied. With their robust construction and reliable locking system, Metaltech's Heavy Duty Scaffolding Caster Wheels offer the stability and ease of use needed for safe and efficient scaffolding setups in any work setting.