Lab Clamp, Dual Adjust, Small, Maximum Grip 35mm, Rod OD x Length (mm): 8 x 120• Dual adjusting knobs• High-strength, nickel-plated, zinc alloy• Vinyl-coated jawsClamps are constructed of high tensile-strength, nickel-plated, zinc alloy which will not rust. Two separate adjusting knobs ensure even pressure on glass to minimize breakage. Jaws are coated with blue vinyl for excellent grip.