3D Printer Extruder Drive Gear for 1.75mm & 3mm - Brass Pulley 5mm 40 Teeth
Fixed screw holes: the M3 thread, two fixed screw holes, fixed more strong, can better avoid skidding gear. Within the fixed screw: M3, six Angle. Material: Brass. Inner hole: 5 mm. Gear parts: 7 mm.