4 PCS FMFXTR Children Bike Bracket Foot Support Side Support Holder, Style: Open 20 inch 1. High elastic spring, strong income and expenditure, no deformation, not easy to fall off 2. Stable support, practical and convenient, durable 3. The welding is strong and stable, and it is not easy to fall off 4. Upgraded adjustable installation (about 2.5 cm adjustable) 5. Scope of application: childrens bicycles 6. Material: carbon steel 7. Specifications: 1214161820 inches 8. Length: open 12 inch about 19 cmpiece, open 14 inch about 21 cmpiece, open 16 inch about 23 cmpiece, open 18 inch about 26 cmpiece, open 20 inch about 28.5 cmpiece, upgraded 12 inch about 21.5 cmpiece, upgraded 14 inch about 23 cmpiece, upgraded 16 inch about 26 cmpiece, upgraded 18 inch about 28 cmpiece, upgraded 20 inch about 30 cmpiece 9. Weight: about 146 gramspiece for 12 inch open, about 150 gramspiece for 14 inch open, about 160 gramspiece for 16 inch open, about 180 gramspiece for 18 inch open, about 220 gramspiece for 20inch open, upgraded 12 inch about 178 gramspiece, upgraded 14 inch about 190 gramspiece, upgraded 16 inch about 200 gramspiece, upgraded 18 inch about 211 gramspiece, upgraded 20 inch about 215 gramspiece