The manual crimpers/decappers fit standard laboratory vials and seals with aluminum caps. The manual flip-off crimpers are specially designed to crimp flip-off caps. The ergonomic curved handle provides more hand comfort during use compared to metal grip designs. The bottom pull handle allows for a steady hold and there is no more "extra" squeeze required. An easily viewed adjustment knob is located at the head of the crimper so that it is easy to determine when the desired crimp setting has been reached.