Features ⭐WEAR RESISTANT MATERIAL: Made of excellent high carbon steel material with heat treated, possess high strength surface treated, wear resistant to ensure long service life ⭐NO EDGE DROP: Combination of round alloy blades, each blade bears part of the workload and not easy to drop the edge ⭐FIRM WELDING: Adopt high frequency welding technology, the welding opening is very firm, the inner and outer welding ports are smooth, and the appearance of the joint is accurate ⭐WIDE USES: Used for the connection of electric hammers and impact drilling equipment and the conversion of water drill hole openers ⭐FOR WALL: This electric hollow core drill bit shank can achieve core removal of concrete, cement, stone wall, useful and practical Specification: Item Type: Electric Hollow Core Drill Bit Shank Material: High carbon steel Color: Silver Specifications: Approx. 330mm / 12.99in Wide Application: Used for the connection of electric hammers and impact drilling equipment and the conversion of water drill hole openers Package List:1 x Connecting Rod1 x Drill1 x Hex Wrench1 x Nut Package List 1 x Connecting Rod 1 x Drill 1 x Hex Wrench 1 x Nut