ERGO Textured Slim Line Rail Cover - Black 3 Pack. 8 in Width: 4 in Height: 6.8 in Weight: 0.12 lb Quantity: 3 Features of ERGO Textured Slim Line Rail Cover Protects rails from damage and protects shooters from rail edges. Prevents damage to skin gear and clothing that contacts rail edges Rubbery grip surface for improved weapon control Fits all 1913 Picatinny Rail Systems Package Contents: ERGO Textured Slim Line Rail Cover What firearm models does the manufacturer say ERGO Textured Slim Line Rail Cover is compatible with? The manufacturer says that ERGO Textured Slim Line Rail Cover is compatible with AR-15 AK-47 AR-10 AK-74ERGO 4379-3PK-BK: Textured Slim Line Rail Cover - Black 3 Pack