[15 different sizes to meet your needs. different requirements] The knurled nut; Brass barrel contains 330 knurled nuts and a total of 15 different sizes of threaded inserts: M2: 4 x 3.5 mm, M4: 4 x 6 mm, M2: 6 x 3.5 mm, M4: 6 x 6 mm, M2: 8 x 3, 5mm M4: 8x6mm M2: 10x3.5mm M4: 10x6mm M3: 4x5mm M5: 6x7mm M3: 6x5mm M5: 8 x 7 mm, M3: 8 x 5 mm, M5: 50 x 7 mm, M5: 10 x 7 mm slot nut consists of ; made of high quality brass, which has the characteristics of hardness. high, resistance to wear, resistance to oxidation, resistance to corrosion, resistance to corrosion, resistance to heat, long service life, high pressure and no deformation, and stable integration. [Easy to install. use] ?Nuts heavy-duty pressure, threaded inserts are self-locking nuts. Print developed for later insertion into 3D printer parts such as Creality, Anycubic or Prusa printers. The nut with spring can be easily integrated; into the blind hole or through hole by ultrasonic or heating (soldering iron). [Standard