Wensilon Extension Concrete Drill Bit Lengthening 1pcs 1" X 30" Cross-Type Double Thread Carbide Material Suitable for Concrete, Brick, Cement Walls, Stone, Extra Long Hammer Drill Bits for ConcreteBrand: Wensilon Features: SIZE INTRODUCTION: The total length is 30 inches. Alloy Cutter Head: The harder cross cutter is easier and more efficient for drilling work. Material: High strength alloy steel is made by Wensilon, very hard. Ripple design: double line of drill bit design, drilling and punching is faster, stone powder is easier to peel off from the wall. Compatible with most brands of impact drills on the market Part Number: XZCJZ044 Package