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The key parts of the 3D printer - Heated aluminum block insulation, the benefit is the internal temperature changes gently, while saving power, to achieve energy saving effect. Specification: Material: Aluminum Heater block Dimension: 20*20*10 mm Heat insulation cotton Dimension: 70*20*3 mm Inner hole for set screw: M6 and M3 Heater Mounting Hole: 6mm diameter Thermocouple Mounting Holes:3mm diameter Package Included: 5 x Aluminum Heater Block 10 x 3D printer heating block cottons Please kindly Note: The heat insulation cotton Does Not have the pre-punched holes, it's easy to bore a hole.