I be very dissappointed with this item . do not last a day . the Streamlight Adjust-a-Clamp be vastly superior . stainless steel construction and it be CHEAPER too . my current streamlight set have be in heavy constant use in my truck for over 15 year . the rubber have wear off a few time but it still hold my flashlight ! customer who be unhappy with the mag instrument product should check out the streamlight clamp .