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5Pcs MK7/MK8 Heating Aluminum Block For 3D Printer Feature: Size: 20 x 20 x 10mm Material: Aluminum Weight: 6g Hose and nozzle mounting holes: M6 Heating rod mounting hole diameter: 6mm Screw hole: M3 Thermocouple mounting holes: M3 Screws: M3, six angles inner Package included: 5 x Heating aluminum block