This is a genuine replacement idle screw restrictor that is designed for select lawn and garden equipment engines. The idle restrictor screw is what is responsible for controlling the engine idle or engaging the engine to allow the machine to do its job. This is a durable screw, but it is subject to repetitive motion and constant wear, which means it can become damaged over time. In some cases, it may even get lost in the course of other repairs. It needs to be replaced because the machine will not work without it.This genuine OEM idle screw restrictor is manufactured by Tecumseh. It meets exact standards as an original replacement part and it can be used in machines from Lawn Boy, MTD, and Toro, as well. The part is sold individually. Other parts or hardware will require a separate purchase. A pair of pliers and a screwdriver will be necessary to make this repair. It is important to wear gloves when performing repairs on snow throwers and lawnmowers. Be sure to allow the engine to cool completely before doing any work and always work in a well-ventilated area.