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Include: 1 *coupler; 1 *M4 screw; 1* wrench Usage: Installed at the toy car, connecting shaft and the wheel, very useful! Very good quality! Please tell me which length you need, Or I will send the 3mm diameter coupler! Material: brass (pure copper) Hole Diameter: 3mm; 4mm; 5mm; 6mm; 7mm; 8mm Please inform me which length you need, Or I will ship the 3mm diameter coupler! Size: Please confer with the photographs Screw diameter: 4 mm (send M4 screw) Payment: We accept all payment as below. Credit card, T/T bank, Moneybookers, debit card. If you've any question about payment,please feel free to contact us. If you've got any issues of payment,you may well get help from this link. http://help.aliexpress.com/pay_order.html Shipping: We will deliver out parcels in 3days after charge approved. We use global Economy Shipping, so we don't present tracking numbers. If you wish a monitoring number, it's best to inform me, and pay an additional $1.5. Please understand! Order put on weekend or vacation might be shipped out on Monday or subsequent working day. If it's out of stock,we desire a little time to task and we are able to depart observe or messages for that. We don't pay for the customs tax charged from native customs. Delivery time only for reference.It can be faster or slower sometimes.As it isn't very step by step delivery by way of China Post Air Mail.We will activity each parcelss. The approximate transport time to diversified countries beneath is barely in your news only, which is estimated, now not guaranteed. 1: USA: 10-39 working days. 2: Russia: 12-55 working days. 3: Europe country: 10-55 working days. 4: Other countries: 15-55 working days. Shipping ways: We chiefly use China Post Economy Air Mail to carry your parcel. Replacement/Exchange/Refund: Please verify the equipment and goods intently after receiving.If any damaged,please tack pictures as evidence first.Then you have to touch us for after sale service. Please kindly contact us first if ther is any problems with your order before opening dispute.Thanks in your knowing and support.We will resolve until making every single customer satisfied in a reasonable way. If you don't obtain parcel inside guarantee time,please kindly await more time.Your parcel could also be delayed through wide parcels for post,so they process slowly than normal. 1: We accept exchange or update within 14-30 days for faulty merchandise Or whenever you obtained the wrong item. Or we can refund your cash back. 2: Buyers who buy a wrong merchandise must contact with us in time, notwithstanding if the wrong merchandise we sent out and you want us to remedy it, Then it is best to come up with the money for all of the prices (includes common freight, dealing with fees and the return freight, etc.) 3: Unwished product returns could be charged a 15% restocking fee only if item is similar to the condition as which we despatched out. Buyer must pay for the delivery fee to ship items back. Feedback: Your feedback is very important for our store.So please contact us instantly earlier than leaving destructive feedback if there anything make you are not convinced or angry.We will try and clear up challenge until you're satisfied. If you're satisfied with our store.Please depart a positive feedback.And useful comments for other customers. Item as describes:5 stars communication:5 stars Shipping Speed:5 stars