W&H WA-99 Electric Handpiece. Given a little practice, this handpiece will be your tool for keeping patients comfortable and happy. 40,000 rpm W&H electric motor attached to the W&H WA-99 LT 1:5 speed increasing contra angle provides constant torque at 200,000 rpm can perform some serious work. Another great thing about this particular setup is, with a little TLC from your staff, it should make fewer trips to the repair shop. Gear sets are robust, and hold up to the autoclave better than most.