Item Type: 3D Printer Part Aluminium Heater Block: Material: Aluminium Net Weight: Approx. 6 g / 0.21 oz Fixing Screw Inner Hole: M3, M6 Heating Tube Inner Hole: Approx. 6mm / 0.24in Thermocouple Inner Hole: Approx. 3mm / 0.12in Application: For 3D printer extruder, for CR10, for CR10S, for CR10 S5, for Ender 3, for Ender 3 Pro, for Ender 5, for Ender 5 Pro, for CR10S Pro V2, etc. Silicone Sock: Material: Flame retardant insulating silicone. Features: Use flame retardant materials with good insulation to keep the heating block and nozzle clean. Package List 3 x Aluminium Heater Block 3 x Stainless Steel Throat 3 x Silicone Sock 3 sets includes 3pcs aluminium heater block, 3pcs stainless steel throat and 3pcs silicone sock. 13 Sets in All: Comes with 3 sets of 3D Printer silicone sock, aluminium heater block and stainless steel throat. 2Perfect Match: For Ender 3, for Ender 3 Pro, for Ender 5, for Ender 5 Pro , for CR10, for CR10S, for S4, for S5. 3Quick Cooling: Promoting the heat dissipation, these 3D printer accessories guarantee stable working performance. 4Reliable Work: Allows for higher safety and better effects in high temperature printing, very efficient as well. 5Easy to Install: Designed to have a light weight and a compact size, the installation can be quickly completed.