1. Material: iron 2. Purpose: A hitch for attaching a bicycle trailer to the rear axle of a bicycle 3. Applicable: suitable for most bicycle trailers 4. Features: sturdy and durable, not easy to rust, easy to connect, wide applicability 5. Bolt hole diameter: about 11 mm 6. Diameter of trailer handle rod hole: about 7 mm 7. The diameter of the shaft nut recessed area: about 22mm 8. Bottom plate length: about 55 mm 9. Weight: Set 1: 430g, Set 2: 381g, Set 3: 233g, Set 4: 172g
