These are very snug fit couplers to fit over the splined shaft of motors such as the Siemens and UQM. You must heat them to about 300F to install them over the splined shaft. When cool, they will have a very tight fit. They are also blank. This is so you can machine them further to fit specific flywheels and horizontal distances from motor face. So additional machining will normally be required. These couplers represent the hard part - Electric Discharge Machining to produce the involute spline for the motor shaft. These blanks are then further machined to fit flywheels normally.
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