3/8 Inch x 72 Inch D’VersiBIT Flexible Drill BitProduct Details:* Bit Diameter: 3/8″ (9.5 mm)* Shaft Length: 72″ (1828.8 mm)* Shaft Diameter: 3/16″ (4.8 mm)* For Drilling in Wood and Light Sheet Metal.* Excellent for Tough Woods and Thick Obstacles* The D’VersiBIT System Attaches a Quality Drill Bit to a Long Flexible Spring Steel Shaft* These Flexible Steel Drill Bits is the Right Tool For Installing Wire or Cable Inside Existing Walls* Bends to Meet Your NeedsGreenlee06-03-72C