With glass fibre, reinforced jaws and a strong 20mm x 6mm steel bar, these clamps perform well. The biggest advantage is their simple, single-handed operation, leaving one hand free to steady the work. Simply squeezing the handles to operate the clamp, results in great control. They have non-slip inserts and the rear handle houses the release trigger. An easily operated locking mechanism on the fixed jaw, locks or unlocks the jaw to convert the clamp into a spreader. The jaw pads are tough and non-marring with a little ‘give’ to grip irregularly shaped work. Lifetime Guarantee.