This Gripper is built to last, has two 200 lb pull Neodymium magnets giving it 400 lbs total pull. This is a must have for the technician or individual that has to endure the elements while working in the field.The Gripper is a magnetic holder designed to hold a beach style umbrella that is also adjustable in height and hold it in place on ferrous materials ( 6' to 7' umbrellas work best and pole size 1" to 1,1/4" ). Its main design is for the hvac field. It will attach to the top or sides of the unit. It also has a tightening knob to secure the umbrella pol in place.