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Feature: Material:Metal Material:Metal Color: Silver Size: Cutting Diameter:65mm / 2.6" Total Length:70mm / 2.8" Suitable For: brick, concrete walls, air conditioning openings Packing Included: 1 x Wall Hole drill bit. Notice: In order to the locking screw more stable on the drill and for your sefety, please as the clockwise to use it when you drill the wall holes, thank you. It’s suitable for drilling concrete, but the hardness of concrete should not exceed C40. For ease of use, please confirm the size before purchase!