The Massca Aluminum Quick Gear Clamp is made of aluminum alloy steel and a carbon steel bar with a clamping power of up to 660lbs of pressure. Made almost entirely of heavy-duty metal, it's unlike any other gear clamp on the market. Whether you are on the job, in the workshop, or right at home, the Massca Aluminum Quick Gear Clamp will be the extra hand you need to get the job done quickly and easily. Crafted with quality in mind. It's built to last a lifetime and offer the secure hold you've been searching for.