The drill bits will clean your printer nozzles very well and make it printing better. It is made of metalwith good flexibility, not rust or break easily. Compatible with most of 3D printers extruder nozzles. It can be applied to accurately measure the diameter of nozzle holes, you can use it to clean the small size nozzles and other small parts by this tool kit, such as gear. Features - Color: Silver. - Material: Copper, stainless steel. - Size of copper needle: 7.5 x 0.04 cm/3 x 0.016 inch. - Size of silver needle: 7 x 0.035 cm/2.8 x 0.014 inch. - Function: it can be applied to accurately measure the diameter of nozzle holes, you can use it to clean the small size nozzles and other small parts by this tool kit, such as gear. - It is made of metal with good flexibility, not rust or break easily. - The drill bits will clean your printer nozzles very well and make it printing better. - Compatible with most of 3D printers extruder nozzles. - 10pcs of nozzle drills applicable in your daily life, and they are stored in a box, in case of missing. Package list: 15 needles 15 x silver neeedle