The Kensington Guide Wire Coaxial Bone Biopsy Kit is a guide wire system used in deep bone and sensitive procedures which demands a very precise approach. The device comes in 1 gauge and two lengths (10 and 15 cm) and includes a 20 gauge guide wire for anchoring the needle into the bone, an introducer positioned over the guide wire based on Seldinger technique, a 13 gauge biopsy needle with trephine tip and an ejector pin.