This Proxxon AC Adapter NG5 Variable Speed control comes in a compact Noryl casing. The Noryl material is heat resistant and recommended for transformers. The thyristor electronic control with feedback allows for optimum tool speed and high torque at low speeds. NO DISCOUNTS
You may also want to consider a Keyless Chuck to use with either Handpiece for fast bit changes. Accepts accessories with shanks from 1/64" - 1/8" (0,5 - 3,2 mm).