. Their unique design features a substantial base that simply won’t yield under pressure, and they’re made of a high-strength plastic that’s nearly indestructible. . Tested extensively at high-cycle rates that mimic real life, they’ve been proven to 50 tons. . Broken roller buttons lead to downtime, hotwork, decreased productivity – and lower profits. . Rated load: 50 tons. . Working line load: 50,000 lbs.