Review on Weiler Dualife Threaded Partial Diameter by Josh Sharp

They work well, but those who want to buy them should know that they are concave. The knobby bristles point downward at about a 30 degree angle and with the way they screw onto your grinder they will absolutely hang under the guard. You'll either have to buy a new guard that hangs an inch lower, or be prepared to use it without your guard protected.