SPECIFICATION Material: PolymerColor: BlackSingle size: 6.5*3.5*2.1cm/2.36*1.38*0.83inch FEATURES100% brand new and high quality.These are incredibly reliable sights and easy to install and operate.They fit on all 20mm rail and lock easily into place.Professional and simulation training purposesHeavy Duty Tactical Gear Front and Rear Back-up Sight Set for hunting and training.Full Heavy Duty Polymer Construction for Durability.Notice: They only fit on 20mm rail and lock easily into place. PACKAGEOne (1) Pair of folding sightsRETURNFor defective or wrong items received : Buyers must report to the Seller within 30 days after received of goods. For defective item, Buyers must send with email of photos indicating the area and condition of defects. Upon acknowledgement by the Seller, the item must be returned within 30 days thereof. Actual postage fee for returning, as well as costs for re-sending the replacement item will be borne by the Seller. For exchange of sizes : We may accept exchange of sizes subject to our stock availability. If accepted, the Buyers must return the item at their own expenses No exchanges or returns will be accepted for any reasons other than the aboveSHIPMENTPlease complete your delivery address with contact phone number, especially Russia buyer, please confirm your full name. Please make sure the delivery address is correct before payment.Products will be shipped out within 3 working days after payment confirmation.We are not responsible for any customs tax or import tax.We are sincerely sorry if you do not receive your items in the limited time, please contact us first. We will handle it together with you to get your satisfaction again.CASE & FEEDBACKWe highly respect customers' advice, praise and complaints, absorbing every useful information to get a better product supplying.When you are satisfied with products and service, please leave positive feedback, we will slove it for you asap.If you have any problem regarding your transaction, please contact us first. We will try our best to meet your satisfaction rather than getting a poor feedback from you.Any problems,please do not hesitate to contact us at first time before we always try our best to solve it for you!