JOT manufacture Safety Clamps are also available in Hydraulic model, which is installed easier and faster without using a nut or wrench. The Hydraulic Safety Clamp operates by a foot or hand actuated Air Hydraulic pump that is assembled with Safety Clamp. The Hydraulic safety clamps are not designed to hold or hoist the string weight – use in conjunction with slips, the end user determines the clamping torque necessary to prevent marking/damaging tubular.