This probe comes with a built-in step that allows for additional pressure to help drive the sampler body into the ground. This nickel-plated, rust-resistant step probes is designed to be used without liners and is a one one-piece models. This model includes the slotted probe body, a built in step, and a 10″ comfortably gripped cross handle. This regular step soil probe is made of heavy-wall type 4130 chrome molybdenum steel. This sampler is 7/8″ OD x 5/8″ ID with a 12″ slot. It cuts a soil core that is about 12″ long. The heavy duty material and sturdy design prevent the probe body from bending or twisting out of shape.