The Massca Aluminum Quick Gear Clamp is made of aluminum alloy steel and a carbon steel bar with a clamping power of up to 660 lb of pressure. Made almost entirely of heavy-duty metal, this quick gear clamp is unlike any other gear clamp on the market. Whether you are on the job, in the workshop, or right at home, this quick gear clamp will be the extra hand you need to get the job done quickly and easily. Crafted with quality in mind, this 12 in. aluminum clamp is built to last a lifetime and offer the secure hold you've been searching for.