About this 3D model

Replacement knobs for the Harbor Freight A/C Gauge set. Mine broke after a few months of use. I didn't have to file or clean anything up to get them to fit, but they are definitely a tight fit. Gauges: http://www.harborfreight.com/a-c-manifold-gauge-set-92649.html 30mm total height 6mm hole diameter 13mm hole depth