This extension lets you sample 3 feet deeper than the length of your sampling tube. (6 feet with a 3 foot tube) If you want to sample deeper than that you will need to purchase one or more JMC ESP Plus Regular Extensions in addition to this extension.
In spite of its name, the Clay Auger will sample the widest variety of soils. Good for most soils between dry sand and wet mud. Fits all JMC Quick Connect Professional Auger components.
Assembly fits manual sliding hammer for the JMC Environmentalist's Sub-Soil Probe PLUS (1.2 inch diameter sampler). This is the part that rests on the top of the sampling tube that fits up inside the heavy sleeve of the hammer.
The heavy (12 pounds) metal sleeve that moves up and down while pounding the sampling tube into the ground. Fits both the JMC Environmentalist's Sub-Soil Probe and the JMC Environmentalist's Sub-Soil Probe PLUS.