SQR Series square plugs feature a series of externally tapered ribs designed to accommodate a wide range of tubing gauges while also satisfying the fit adjustments on tubing with inside dimensional fluctuations. The exterior ribs are designed to provide a sure grip inside a tube without the unsightly plastic shavings found on many straight wall glide installations. Will not rust or corrode. : : A: 1.500, B: 0.52, TUBEOD IN: 1.500, WALL THICK: 10-14 Ga. (.134-.083).