Features Wear Resistant Material: Made of high-quality high-carbon steel material, heat-treated, with high-strength surface treatment, wear-resistant, to ensure long service life. No Edge Drop: Combination of round alloy blades, each blade bears part of the workload, not easy to fall off, durable, easy to store and carry. Firm Welding: High-frequency welding technology is adopted, the welding opening is very firm, the inner and outer welding ports are smooth, and the joint appearance is accurate. Wide Range of Uses: Used for the connection of electric hammer and impact drilling equipment and the conversion of water drill hole openers. For Wall: This electric hollow drill shank can realize coring of concrete, cement, stone walls, practical and practical, very suitable for drilling concrete walls, stones, bricks, cement, masonry, aerated blocks, slump blocks, air conditioners Install. 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 Rod 1 x Drill 1 x Hex Wrench 1 x Nut Package List 1 x Connecting Rod 1 x Drill 1 x Hex Wrench 1 x Nut