This tube features a self-sharpening tip that cuts great looking cores and outlasts common replaceable tips eight to one. Works best in soft, moist soils. Sample core measures 0.688 inches in diameter. Length is 9 inches. Hardened cutting tip. All metal parts nickel-plated to protect against rust and wear. Easily cleaned with the JMC Special Cleaner tool. Compatible with all JMC Backsaver, Conventional, Collapsible, and "T" Handles.