3 D 3D Printer Leveling Nut Kit -10 Ender-3 Adjustment Heated Bed Spring
And our knobs are made of plastic material, make the leveling is safer and does not hurt the hand. The torque of the hand is large, making it easier to the hot bed. The leveling includes 4 x upgrade leveling nuts, 4 x springs, and 4 x screws.