Features: Widely use for connecting Bowden extruder and PE outside diameter 4mm, inside diameter 2mm For 3D Printer 1.75mm filamentery, easy to install TF tube. For PC4-M10 fittings thread , inner diameter(black end) 4mm, the fitting made of high qulity stainless steel and plastic, high hardness, antioxidtion, anti corrosion. Compatibility: for all 1.75mm PLA ABS 3D printer Connecting by the outer thread of the quick fitting. Specifications: Inside Diameter: 2mm Outside Diameter: 4mm Length:18.5mm Color: Black Type: PC4 01 Thread: M10 Material: Stainless Steel Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 10PCS PC4-01 Pneumatic Connector