tahanson43206 This version of the Squirrel Roller Holder has mounting holes of diameter 6.35 mm (1/4 inch). The earlier version has mounting holes of 3.9 mm diameter (7/64 inch). The axles are sized to fit 1/2 inch PVC pipe VERY loosely, so they spin easily. A set of these holders can be mounted on a neighborhood fence to discourage travel along the fence top.
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