Bessey rapid action lever clamps are up to 5X faster to use than the already extremely quick original sliding arm design. Another benefit of the style of clamp is that the positive locking ratchet action will not loosen due to vibration. The positive lock provided by the interlocking teeth will not let go until you make it happen by squeezing the trigger release. An especially useful trait when securing portable power tools to temporary work surfaces. These lever action sliding arm clamps can be positioned and repositioned quickly and securely. Designed and manufactured for years of dependable service, these clamps are made in Bessey own German production facilities and, from steel that comes from Bessey own European steel mills. Bessey created the first sliding arm clamp and to this day remains the category leader in both quality and design.