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Features: ✔One of the essential Tools for Home Renovation. ✔Simple operation, easy to use,and fast perforated. ✔Made of carbide tipped metal material,very durable. ✔Length according to customer needs, excellent quality. ✔SDS plus shank, male thread Adapter,Greatly replace the broken adapter with your drill chuck. Tips: Use metal hole opener to pay attention to safety, pay special attention to the protection of the eye. Pay attention to coolant when operating. Specification: Size: Cutting Diameter: 50mm/ 1.97" Material: Cr40+YG11C alloy Packing specification: 1*110mm long connecting rods,including conventional SDS-Plus round handle, 1*single hollow drill bit, 1*Center positioning guide, 1* positioning drill screw