This is a genuine Murray replacement part, it is sold individually. It is commonly used in lawn tractors, and is used in various places in the compatible models listed below. It is self tapping, with a 9/16 hex head. Made of metal.

Genuine OEM replacement Blade, this item is sold individually.
This Blade is used on the Lawn Tractor models shown below.
Most of the Lawn Tractors listed below will use 3 of these blades.
It would be a good idea to purchase 3 extra blades so when your blades on the Tractor need sharpening, you can use your extras.

Genuine Murray replacement part, this item is sold individually.
This blade is used on all the Lawn Tractors listed below.
Some manufacture send out their blades not completely sharpened (For Liability Proposes).
We have an article and video on how to do this in our Repair Center. Or you can have a local lawn shop do this for you.
Make sure you put the new Blade on the same way the old on was on.

This is a genuine Murray replacement blade, it is sold individually.
It is used on the Mowers listed below.

It is a (3N1) Blade, that can be used for bagging, side discharge and mulching the lawn clippings. 42 inches is a reference to the cut, as there are two blades attached to the deck of the tractor.

This is a genuine Murray replacement part, it is sold individually.
The Jackshaft housing is connected to the drive shaft, which is connected to the pulley driven by the belts and engine.
Below the Jackshaft Housing, the blade adapter, blade, washers and blade nut are attached to the drive shaft.
The Jackshaft Housing does include the bearing and a zerk fitting.

This is an OEM replacement part and is sold individually.
Its propose is to deliver an electric current from an ignition system to the combustion chamber of a gas fueled engine.
It will ignite the air fuel mixture by the spark.
Spark Plugs will usually have to gapped to the manufactures specifications found in the owners manual.

Over time a Spark Plug will become fouled because the air/fuel ratio may be set wrong,worn piston rings, carbon build up and other factors.
It is better to replace a fouled spark plug, rather then trying to clean it.