Metal Springs 450pcs Mini Return Springs Set, 0.3mm/0.4mm/0.5mm WD Mini Pen Return Spring, Stainless Steel Return Spring 10-30mm Long Metal Springs

WIDE Used for: Widely used in doors, curtain, automobiles, bicycles, Steel devices, umbrella, kettle, razor, aircraft, antique tape recorder, repair toy, pliers, piano, scissors, electrical, etc [Package Include] -- 15 Different Sizes, 450 Pieces Return spring in total. [Material] -- 304 Stainless Steel [Specification] -- Size = WD * OD * Long [Size Label Marked] -- The Return springs are organized in a neatly and transparent box with a size label marked. [Used for] -- These 15 different sizes Return spring can fit most of 3D printer DIY project.