Sherline Oversize Handwheel P/N 3410 Sherline 3410 Sherline Oversize Handwheel (Metric)-These Sherline larger 2-1/2" diameter handwheels are graduated the same as the smaller handwheels provided as standard equipment with the lathe and mill. The larger size makes them easier to read and to turn, plus it offers a little more substantial "feel" when working with the tools.