The Axminster Professional Heavy Duty Parallel Jaw clamp comes with a lifetime guarantee. The bar is zinc plated, cold drawn steel, profiled to minimise flexing and bending. Hardened rollers in the moving head maintain a constant 90° angle under load. A patented anti-slip system prevents the sliding head from sliding under pressure. The heads, encased in a glue resistant moulding are non-marring. The large clamping surface avoids damage to delicate surfaces. A unique swivelling handle allows you to apply greater clamping pressure. Supports keep the cramp level and stable when used on the assembly bench. The sliding head is reversible, turning the cramp into a spreader.