Threaded Collar fits manual sliding hammer for both the JMC Environmentalist's Sub-Soil Probe (0.8 inch diameter sampler) and the JMC Environmentalist's Sub-Soil Probe Plus (1.2 inch diameter sampler).
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.