Bulldog Gear - Pin-Pipe SafetiesPin Pipe Safeties are compatible with our 80mm x 80mm Mammoth Lite Power Racks. The safeties are available in 3 different sizes corresponding to the depths of the associated units. Leading gyms have relied on traditional pin pipe systems for years as a proven way to protect both their athletes and their equipment when a spotter may not be available. These systems are extremely durable, but users should still be cautioned against dropping heavy loads