Spring Outside Diameter:8mm Spring Inner Diameter:4mm Spring High:25mm Use for:3D Printer Screw:M4*40 Nut:M4 Material:plastic colour:Photo Color Package Contents: 4 * Upgraded Leveling Nut 4 * Hot Bed Spring 4 * Screw Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.