A mower can only do so much. It can't get the grass growing flush against the fence line. It can't get the weeds in your flower bed.
String trimmers trim down what your lawn mower can't, and gas trimmers boast great power and versatility. They can be used for edging, separating your lawn from your walkways.
Gas-powered string trimmers give you the freedom you need to move around a large property, around trees and other obstacles, without becoming tangled by an electrical cord.
Handheld gas string trimmers come in 2-cycle and 4-cycle models, and you can choose between a curved-shaft or straight-shaft. There are also gas handheld power heads, which enable you to attach different heads for trimming grass, trimming hedges, cutting tree limbs, and even cultivating your garden.
They have a greater cutting width, which means you can clear an area with fewer passes. And because they're on wheels, your back won't take such a beating.
Wheeled models have around 22" of cutting width. They have larger engines, large 12-16" wheels, and they clear rugged terrain in very little time.