Ulightfire 46mm Low Profile Rail Adaptor,20mm to 11mm

?Function] This low profile rail adapter is an excellent conversion of 20mm base to 11mm without causing any height raising ?Low Profile& Design] Low profile rail adaptor with spring loaded allows repeatable/consistent alignment and removable stop pins for secure installation .Constructed with aluminium alloy which is sturdy and durable. ?Easy Installation] This rail adaptor with spring tension retraction expansion design easily to snap into picatinny or weaver base ?Specification] Size approximately 46mmX22mmX6mm;Weight: 8g per PCS