Ziamatic QUIC-MOUNT Tool Clips 1/2 Inch diameter pvc coated steel spring clip: Spring steel clips will neatly store all your small tools in vehicles or in-house. No more hunting for misplaced hammers, screw drivers, etc. The clips are black PVC coated carbon steel, tempered per MIL-H-6875. Easy to apply to any surface. A choice of diameters is available to fit all of your needs. Designed to flex 1/16" or .0625". The CL .50 is .50" diameter with a hole diameter of .169". There are 6 pieces to one package.