Our 12-inch speed clamp has a quick-release bar clamp that can convert to a spreader. It features a removable soft padded jaw to protect surfaces from damage and has an adjustable tough grip. Quick-release trigger offers fast closing. Spread: 162mm - 502mm. As a clamp: Press down the black trigger on the handle to slide to the desired position. Squeeze the spanner of the handle to close the jaws to secure. As a spreader: Unscrew and take off the tip jaw. Reverse the jaw open direction and screw it on the opposite end of the bar.