Lead 1/4-20 medium-duty machine screw anchor. Drill size 1/2 in. ST5 installation tool required.
Dottie's machine screw (lead) anchors perform well in a variety of concrete strengths and can be used in brick. Any head style screw can be used. The screw can be easily removed or loosened and retightened. Vibration does not affect the lead insert's hold on the concrete. Adapts well to hole size variations. Drill hole in concrete and drop anchor expander side down into hole. Place setting tool over anchor and hammer until set.